You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you today?

USER: I intend to change my existing reservation which was made on the name of Joseph King. Can you help me updating my reservation?

ASSISTANT: Sure, wait a moment I will check the reservation status.

USER: Ok.

ASSISTANT: Thanks for waiting, we did not found any reservation by this name.

USER: That's ok, thank you.

ASSISTANT: Thanks for opting us.