You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I oblige you today?

USER: Will you please help me in booking a flight ticket with price 500?

ASSISTANT: Sure, can you please let me know your airport codes?

USER: My source point is DCA and destination point is DFW.

ASSISTANT: May I know on which dates would you like to travel?

USER: My travelling dates are from 07/14 to 07/16.

ASSISTANT: May I know your name please?

USER: I am Gary Allen.

ASSISTANT: Ok, please hold on for a moment.

USER: Ok.

ASSISTANT: We found a connected flight with 1005 Spirit airlines and the fare of 100. Shall I proceed with the booking?

USER: Please proceed with booking.

ASSISTANT: Your ticket has been reserved.

USER: Thank you for your assistance.