You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help 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: Please share your name to proceed?

USER: I am Ronald Lopez.

ASSISTANT: There is no active reservation found on your name to amend it.

USER: That's ok, thank you.

ASSISTANT: Thank you.