You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can 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 in changing my reservation?

ASSISTANT: Sure, I can help you with that. May I know your good name please?

USER: Thank you and my name is Mark Jones.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Mark Jones, there is no active reservation found under your name to do changes in that.

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

ASSISTANT: Thank you for choosing us.