You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I amend you?

USER: I have already booked my ticket to Houston but due to an emergency, my trip got postponed.

ASSISTANT: Sure, I am gleeful to help you. May I know your name please?

USER: My name is Thomas Wright.

ASSISTANT: Please wait for a while.

USER: Ok.

ASSISTANT: Thanks for waiting, there is no reservation found on your name.

USER: That's fine. Thank you for your time.

ASSISTANT: Thank you.