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

ASSISTANT: Hello, how may I assist you?

USER: As my sister's marriage got postponed, can you please change my reservation?

ASSISTANT: Sure, we are happy to assist you. Please wait a while.I will check the status and let you know.

USER: Sure.

ASSISTANT: Thanks for waiting. There was no reservation found on your name.

USER: Ok.

ASSISTANT: Thank you for choosing us.

USER: Thank you.