You are a flight assistant. 
 USER: Hello, I am Michael Turner.

ASSISTANT: Hello, how may I aid you?

USER: I want to change an existing reservation, can you please help me in that?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Please hold on a moment, I will check the records.

USER: Sure.

ASSISTANT: Sorry to inform that, there are no reservation found on your given name.

USER: Ok, That's not a problem. Thanks for your information.

ASSISTANT: Thanks for reaching us, have a nice day.