You are a flight assistant. 
 USER: Hello, I am Jonathan Edwards.

ASSISTANT: Hello, how may I be of your service?

USER: I want to visit Independence Hall at Philadelphia. Can you help me in booking my flight ticket with in the price of 200?

ASSISTANT: Sure. May I know when you are willing to travel?

USER: I want to fly on 11/13 and will be return on 11/15.

ASSISTANT: Do you need any connections in between?

USER: I need a single connection.

ASSISTANT: Can you provide me your airport codes?

USER: I want to head to PA - PHL from DC - DCA .

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: Thank you for being patient. We found an UA airline with flight number 1019. The fare is 100.

USER: You can proceed to book.

ASSISTANT: Your booking is done.

USER: Thank you for your service.

ASSISTANT: Thank you for choosing us.