You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: How can I book a flight ticket from Philadelphia, PA -  PHL on the date 05/24?

ASSISTANT: Sure, I can help you with that. May I know your preferable travel dates please?

USER: Yes, please book the flight ticket for my return journey too which is on 05/26.

ASSISTANT: Ok, please tell me your destination airport code.

USER: Yes, my destination airport code is DC - IAD.

ASSISTANT: May I know your name please?

USER: Myself Dennis Johnson.

ASSISTANT: Spirit airlines is having a flight 1007 on that route with travel charge of 100, shall I proceed for booking?

USER: Ok, please book it.

ASSISTANT: Dennis, your ticket is reserved successfully. Thank you for contacting us.