You are a flight assistant. 
 USER: Hello.

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: Sure, may I know your name?

USER: Myself Melissa Harris.

ASSISTANT: Ok, please wait. Let me check your reservation status.

USER: Ok.

ASSISTANT: Sorry, I did not find any reservation under your name in our database.

USER: It's ok, thank you.

ASSISTANT: You are welcome and thank you for choosing us.