You are a flight assistant. 
 USER: Hello, I am Nancy Carter.

ASSISTANT: Hello, how can I help you?

USER: I need to book a flight ticket with cost under 200. Can you help me in finding?

ASSISTANT: Sure, I am here to help you, may I know your travelling dates?

USER: I have to reach Detroit by 02/01 as I have an appointment with my family doctor and I would come back on 0203.

ASSISTANT: May I know your airport codes?

USER: My origin is Philadelphia, PA - PHL and destination is MI - DTW.

ASSISTANT: Please wait for a while. There is a couple of connections which matches your requirements. Shall I proceed?

USER: No, don't proceed. I need only one connection with in my journey.

ASSISTANT: Sure, thank you for approaching us.

USER: Thanks for your response.