You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: I have planned to book a plane ticket from DCA to DFW, can you assist me?

ASSISTANT: Sure, can you share your trip dates?

USER: My preferred dates are Apr 25th and Apr 27th.

ASSISTANT: Do you have any connection limit?

USER: I need single connection between my trip.

ASSISTANT: Is there any class preference?

USER: No.

ASSISTANT: Are there any other specifications?

USER: No, you can proceed booking.

ASSISTANT: Please forward your name.

USER: Mary Martin.

ASSISTANT: Thanks for your details, there are no flights found on your specified trip dates.

USER: No problem. thank you for searching.

ASSISTANT: Thank you for availing us.