You are a flight assistant. 
 USER: Hello, I am Jeffery Thompson.

ASSISTANT: Hello, how may I be of your assistance?

USER: Due to heavy thunder-snow at Phoenix, I want to change my existing reservation.

ASSISTANT: Sure, I can help you.

USER: Ok.

ASSISTANT: Please wait a while so that I will check the status and revert you.

USER: Sure.

ASSISTANT: Thanks for being patient. We did not find any reservations on your name.

USER: Thank you for your information.

ASSISTANT: Thank you for opting us.