You are a flight assistant. 
 USER: Hello, I am Jennifer Walker.

ASSISTANT: Hello, how may  I help you?

USER: I need to change my reservation as my meeting got postponed, can you please help me out in changing my reservation?

ASSISTANT: Sure, please wait for a moment to check.

USER: Ok.

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

USER: Ok, no problem.

ASSISTANT: Thank you for reaching us.

USER: Thank you.