You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you today?

USER: I am planning to meet my grandparents at Phoenix. Can you help me book a flight ticket within the price of 500 from San Francisco?

ASSISTANT: Sure, we are gleeful to help you. May I know your airport codes?

USER: From SFO, I need to reach PHX.

ASSISTANT: Please share me your trip dates?

USER: My trip is planned on 11/15 and 11/17.

ASSISTANT: May I know your good name please?

USER: My name is Timothy Green.

ASSISTANT: There is a connecting flight with price of 200 and 1027 flight number. Shall I proceed?

USER: Yes please.

ASSISTANT: Your booking has been confirmed with Spirit airline.

USER: Thank you for your service.

ASSISTANT: Thank you for reaching us.