You are a flight assistant. 
 USER: Hello, I am Donna Campbell.

ASSISTANT: Hello, how can I assist you?

USER: I have planned to visit Independence hall at Philadelphia, PA - PHL. Can you please book a plane ticket with a flag stop?

ASSISTANT: Sure, when are you planning to travel?

USER: My departure will be on 08/02 and return on 08/04.

ASSISTANT: Let me know your origin airport code?

USER: I want to fly from Houston, TX - HOU.

ASSISTANT: Please provide your specifications.

USER: I can pay up to 5000.

ASSISTANT: Frontier airlines with single connection and price is 200 of 1016 flight. Shall I proceed?

USER: Yes, you can proceed.

ASSISTANT: Your ticket has been confirmed.

USER: Thanks for your service.

ASSISTANT: Thank you for choosing us.