You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: I am planning to spend free time with my granny who is staying at Detroit, can you help me with booking?

ASSISTANT: Sure, may I know your source and destination airport codes?

USER: My landing point is DTW and takeoff point is DCA.

ASSISTANT: Do you need halt in between your journey?

USER: Yes, I need a whistle stop in between my journey.

ASSISTANT: Could you please provide me your travel dates?

USER: My trip dates are 06/15 and 06/17.

ASSISTANT: May I know your name please?

USER: I am Laura Martinez.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: Sorry, there are no flights found with your given details.

USER: That's ok. Thank you for your quick service.

ASSISTANT: Thank you for choosing us.