You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello,. How can I assist you?

USER: I want to change my reservation due to postpone of my meeting with clients so, ca you please help me with changing my reservation?

ASSISTANT: Sure, may I know your name please?

USER: My name is Paul Smith.

ASSISTANT: Please wait for a minute.

USER: Sure.

ASSISTANT: There is no reservation found with your name.

USER: Not a problem, thank you for the information.

ASSISTANT: Thanks for approaching us.