You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, what kind of service your looking for?

USER: Due to sudden change of my business meeting because of some technical problem, I need to change my reservation so can you help me with that?

ASSISTANT: Sure, please share me your good name.

USER: I am Matthew Thomas.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Sorry to say that, there is no active reservation found on your name.

USER: Ok, no problem.

ASSISTANT: Thank you for opting us.

USER: Thanks for the information.