You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: Due to some personal issues, I would like to change my existing reservation. Can you help me?

ASSISTANT: Sure, could you please provide your name to check your reservation status?

USER: My name is Stephen Johnson.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Sorry to say, there is no reservation on your name in my database.

USER: Its ok, thank you for the information.

ASSISTANT: Thank you for reaching us, have a nice day.