You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I be at your service today?

USER: Can you please help me out with changing my previous booking now?

ASSISTANT: Sure, we are here to help you. May I know your name please?

USER: My booking was done by the name of Samuel Johnson. Please check with my booking status soon.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Sorry no reservation found on your name.

USER: Oh! That's fine. Thank you for checking.

ASSISTANT: Thank you for opting us.

USER: Most welcome.