You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

USER: My name is Raymond Thompson. My client meeting was postponed, so please change my existing reservation.

ASSISTANT: Sure, please wait for few minutes, I will check with your recent reservation status.

USER: Ok.

ASSISTANT: There is no existing reservation find on your name in our data base.

USER: No problem, thank you for your help.

ASSISTANT: Than you for approaching us.