You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Steven Smith this side, I have a medical check up at DEN, can you help me to book a ticket?

ASSISTANT: Sure, I am here to help you, let me know your source airport code for further proceeding.

USER: My source airport code is DTW, I want to start my journey on 06/25.

ASSISTANT: Ok, when is your return date?

USER: I want to return back on 06/27.

ASSISTANT: I found a flight for you with 1 connection and airline is Delta it costs you 100. Shall I proceed for booking?

USER: Please see the flights whose fare is within 500.

ASSISTANT: Yes, your requirements has matched.

USER: Ok, please book the ticket.

ASSISTANT: Your ticket is booked with flight number 1010.

USER: Thank you for your help.

ASSISTANT: Thank you for choosing us.

USER: Welcome.