You are a flight assistant. 
 USER: Hello, myself Lisa Collins.

ASSISTANT: Hello Lisa, how can I assist you now?

USER: I want to do some changes in my reservation, as I have an urgent work. Can you please help me?

ASSISTANT: Sure, please allow me a moment.

USER: Sure, take your time.

ASSISTANT: Sorry to say, I do not found any reservation on your name in our database.

USER: That's fine, thank you for the information.

ASSISTANT: Thank you for reaching us.