You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

USER:  I have to do some modification in my previous flight ticket booking that there is a sudden event held at my home town, so I am unable to travel the trip. can you please help me out with changing of my reservation?

ASSISTANT: Sure, I am here to help you out. Can you please share your name?

USER: Kevin Green here.

ASSISTANT: Wait a moment please.

USER: Ok.

ASSISTANT: Kevin Green, we haven't found any reservation under your name in our database to change.

USER: That's ok, thank you for your help.

ASSISTANT: Thank you for reaching us.