You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today?

USER: As I am planning to meet my old friend to start a new business in San Francisco, can you help me to book a flight ticket within the fare limit 200?

ASSISTANT: Sure, kindly mention your travel dates.

USER: I intend to start on 03/31 and my return date will be on 04/02.

ASSISTANT: May I know your airport codes?

USER: I want to start from PA-PHL to reach CA-SFO.

ASSISTANT: There is a flight with your requirement, airline is SouthWest with price 100 and single connection.

USER: That's fine, you can book the ticket with this airline.

ASSISTANT: Your booking is done.

USER: Thank you for your help in booking.

ASSISTANT: May I know your name?

USER: I am George Perez.

ASSISTANT: Thanks for reaching us.