You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I guide you?

USER: Myself Paul Allen. I would like to change my recent reservation. Could you please help in that?

ASSISTANT: Sure, please wait for a moment.

USER: Sure, take your own time.

ASSISTANT: Sorry, there is no reservation found on your name in our database to change.

USER: That's ok, thank you for giving information.

ASSISTANT: You are most welcome.