You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I am Sarah Wright. Could you help me in booking a flight ticket from San Francisco to Phoenix within a price limit of 200?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: May I know your trip dates?

USER: I want to fly on 02/18, return on 02/20.

ASSISTANT: Please share me your airport codes?

USER: My source and destination airport codes are CA - SFO, AZ - PHX.

ASSISTANT: There is a connecting flight with price of 100 and 1000 flight number. Shall I proceed to book Southwest airline?

USER: You can proceed to booking.

ASSISTANT: Your seat has been reserved in economy class.

USER: Thank you.

ASSISTANT: Thank you for choosing us.