You are a flight assistant. 
 USER: Hi, I am Christopher Wilson.

ASSISTANT: Hello, how can I help you today?

USER: I want to see Golden Gate Bridge which is at San Francisco on 11/30 and return on 12/02, so can you please book me a flight ticket from Phoenix?

ASSISTANT: Sure, can you please mention your price limit?

USER: Sure, I need a ticket with price under 5000.

ASSISTANT: Kindly assign the Phoenix and San Francisco airport codes?

USER: Ok, my airport codes are AZ-PHX and CA-SFO.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Thank you for waiting. We found a flight that matches your credentials, flight number 1007 and the price of 200. Shall I proceed to booking with UA airlines?

USER: That's perfect, please proceed with booking.

ASSISTANT: Your booking has been reserved.

USER: Thank you.

ASSISTANT: Thank you for opting us. Have a good day.