You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I assist you?

USER: I am William Thompson. I need a flight for a sporting event, which is to be held in Phoenix.

ASSISTANT: Sure. Can you please provide travelling details?

USER: Depart on 10/12 and return by 10/14.

ASSISTANT: Can I know your airport codes?

USER: From San Francisco, CA-SFO to AZ-PHX.

ASSISTANT: Do you have any price limit?

USER: Price limit 200. Connections limit 0.

ASSISTANT: Thanks for the information. We did not found any direct flights matching your criterion.

USER: Thanks for the assistance.

ASSISTANT: Thanks for opting us.