You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: Can you please help me to change my reservation?

ASSISTANT: Sure. Can I have your name to check for the existing reservation?

USER: My name is Catherine Allen.

ASSISTANT: Please, hold on a moment.

USER: Sure.

ASSISTANT: Thank you for waiting, I did not find any reservation on your name.

USER: Ok, not a problem. Thank you.

ASSISTANT: Thank you for reaching us.