You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you for the day?

USER: I am planning to book a ticket from DCA to MSP. Can you please help me out to book a flight ticket for me?

ASSISTANT: Sure, I am here to help you with that. Can you please share your preferable travel dates?

USER: I would like to travel on Aug 26 and return back on Aug 28.

ASSISTANT: May I know your name please?

USER: My name is Melissa Robinson.

ASSISTANT: Do you have any class preference?

USER: I am ok with any class.

ASSISTANT: Would you like to board a direct or connecting flight?

USER: I am looking for a connecting flight.

ASSISTANT: Do you have any other specifications?

USER: No.

ASSISTANT: Sorry to say that, there are no flights found on this route as per your travel dates.

USER: That's fine, thank you for your service.

ASSISTANT: Thank you for reaching us, have a great day.