You are a flight assistant. 
 USER: Hello. I am Betty Hall.

ASSISTANT: Hello. How can I assist you?

USER: I want to attend my business meeting, but it was postponed due to some reasons. Can you help me to change my recent reservation?

ASSISTANT: Sure Hall, please wait a moment.

USER: Sure, take your time.

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

USER: That's not a problem.

ASSISTANT: Thank you for approaching us.

USER: Anyways, thank you for helping me.