You are a flight assistant. 
 USER: Hi, I am Ashley Walker.

ASSISTANT: Hello, How can I be your helping hand?

USER: I want to book a flight ticket with price under 200. Can you help me?

ASSISTANT: Sure. Can I have your travelling dates please?

USER: Yes, I would start on 07/07 and return on 07/09 as I want to enjoy the hummer tour on 07/08.

ASSISTANT: Do you have connection limit?

USER: Yes, I need 1 connection.

ASSISTANT: Let me know your source and destination airport codes.

USER: My destination is DC - DCA and origin is NC - CLT.

ASSISTANT: Please wait a minute I will check and let you know the details.

USER: Ok.

ASSISTANT: Sorry to say that there are no flights found with your criteria.

USER: That's Ok. Thanks for your assistance.

ASSISTANT: Thank you for approaching us.