ब्रो  मेरो हजुरबा-हजुरआमा पनि  सकुशल नेपाल पुग्नुभयो सिकागो बाट एक्लै | तिम्रो बुवा आमालाई एउटा कागज देउ | अनि कागजमा यसो लेख |
Write something like this :

Hello, sir/Madam.
My name is xyz. I can not speak English so your help is beyond appreciation. I am travelling from Kathmandu to (transfer place. mention time too ) . then from (transfer place to DC ) be As detailed as you can with your itinerary . please help me board the correct flight.

अनि तिम्रो बुवा आमालाई सके सम्म कालो कोट लगाएको वा टाई लगाएको मान्छेलाई त्यो कागज देखाउन भन | त्यसो गर्दा धेरै जसो एरपोर्टको कर्मचारी संग बुवा आमा सहयोग माग्न पुग्नुहुन्छ र तिनीहरुले सहयोग गर्ने चान्स धेरै हुन्छ | होइन भने पनि , जेनेरल्ली स्पिकिंग, त्यस्तो कपडा लागाउने पढे-लेखेका हुन्छन र सहयोग गर्छन |
दिमाग लगाउ पासा दिमाग, संसार सजिलो छ |

अझै , प्लेनमा खाने कुराको लागी ऐर-होस्टेस को लागी नि एउटा लेटर लेख्देउ | म यो खान्छु, गाई खान्न टाईप को |

Fuel Tank Bro, Great suggestion. Still checking if there are any nepalese traveling on that day via etihad.

Another suggestion if you can't find anyone.
Ask for a wheel chair assistance from Etihad Airways. Those people will take her from the plane and assist in boarding the correct flight.

Thanks I485 and Fuel Tank. I have asked for a wheel chair assistant. Would it be a good idea to have them stay in airport hotel while they are traveling by wheel chair assistant. My fear is if they would have trouble check-in/check out at hotel and go to door for flight. Not sure, how helpful would be the wheel chair service at Abu Dhabi.
Trying to activate this thread one more time, in case if there are anybody traveling on 19th by Etihad. Obviously they will be travelling by wheel chair but if they can meet nepeales, that could be a peace of mind, and would help specially during overnight transit at airport.