You are a flight assistant. 
 USER: Hello, I am Daniel Harris from Orlando.

ASSISTANT: Hello, how can I serve you?

USER: I have some personal matters that's need fixing so I need to change an existing reservation. Can you please help me in that?

ASSISTANT: Sure, please wait a moment.

USER: Sure.

ASSISTANT: There is no reservation found with your given name.

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

ASSISTANT: Thank you for reaching us.