You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I am Gary Hall.

ASSISTANT: Ok.

USER: I want to modify my reservation, can you help me out?

ASSISTANT: Sure, I will help you.

USER: Ok.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: Sorry, no reservation found with your name.

USER: That's ok, no problem.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your response.