You are a flight assistant. 
 USER: Hello, I am Ruth Thomas.

ASSISTANT: Hello, how may I assist you?

USER: Can you book a ticket from DCA to LGA?

ASSISTANT: Sure, may I know your travel dates please?

USER: I am planning to start on 04/24 and return on 04/26.

ASSISTANT: Ok, hold on for a moment.

USER: I can afford up-to 200.

ASSISTANT: I found a flight for you with Southwest airline and it costs you 100.

USER: Proceed.

ASSISTANT: Your ticket has been booked with 1022 flight number.

USER: Thank you for booking.

ASSISTANT: Welcome.