You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I support you at this moment?

USER: Sharon Martin here.

ASSISTANT: Ok.

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 Sharon Martin, I can do for you. Please wait for a couple of minutes.

USER: Ok.

ASSISTANT: Sorry, no reservation found on your name in our reservation database.

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

ASSISTANT: Thank you for choosing us, have a great day.