You are a flight assistant. 
 USER: Hi, I am Michelle Carter.

ASSISTANT: Hello,. How can I amend you toady?

USER: I would like to fly to Phoenix to submit my research documents on 01/16 and I intend to return on 01/18, can you help me to book a flight ticket?

ASSISTANT: Sure, we are here to aid you. What is the budget for your ticket?

USER: I can pay up to 1000.

ASSISTANT: To proceed with further booking I need your airport codes.

USER: I want to start from Chicago, IL-ORD to reach Phoenix, AZ-PHX.

ASSISTANT: Please, stay online.

USER: Ok.

ASSISTANT: Thanks for waiting. We could not find any flight that matches your request.

USER: That's ok, thank for your information.

ASSISTANT: Thank you for reaching us.