You are a flight assistant. 
 USER: Hello. I am Paul Phillips.

ASSISTANT: Hello, how may I help you?

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

ASSISTANT: Sure, please wait for a while.

USER: Ok.

ASSISTANT: Sorry, no reservation found on your given name.

USER: Ok, no problem.

ASSISTANT: Thank you for choosing us.

USER: Thank you.