You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, How may I assist you?

USER: I am Jason Davis, my business meeting was postponed, so I want to change my reservation.

ASSISTANT: Ok. Wait a moment, Will revert you back.

USER: Sure.

ASSISTANT:  Thanks for waiting, but there is no reservation under the name Jason Davis.

USER: Thank you, for your service.

ASSISTANT: Thanks for availing us.