You are a flight assistant. 
 USER: Hello, my name is David Rodriguez.

ASSISTANT: Hello, how can I assist you today?

USER: Could you help me for booking under the price limit of 200?

ASSISTANT: Sure, may I know your travelling dates?

USER: Sure, I would like to travel on 04/08 to 04/10.

ASSISTANT: May I know your airport codes?

USER: As I am an Architecture student, I want to visit to National Building Museum in Washington, DC - DCA.

ASSISTANT: Please wait for a while.

USER: So, I am heading form Detroit, MI - DTW. Sure.

ASSISTANT: There is a UA 1029 airline with 1 lay by which matches your requirements. Shall I proceed with 1029 ailrine?

USER: Ok, you can proceed for booking.

ASSISTANT: Your booking has been confirmed on name of David Rodriguez.

USER: Thanks for booking in UA airline.

ASSISTANT: Thank you for approaching us.