You are a flight assistant. 
 USER: Hi, I am Timothy Smith.

ASSISTANT: Hello, how may I oblige you?

USER: As my trip got postponed I want to change my reservation, so can you please help me in changing my reservation?

ASSISTANT: Sure, please wait for a moment. I will check the status and revert you.

USER: Sure, take your own time.

ASSISTANT: We could not find any reservation made by the name you mentioned above.

USER: That's fine, thank you for the response.

ASSISTANT: Thank you for choosing us.