You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

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

ASSISTANT: Sure, can you provide your trip dates to book your seat?

USER: I am planning to travel on Apr 29 and return back on May 01.

ASSISTANT: May I know your name?

USER: My name is Ashley Lopez.

ASSISTANT: Do you need any connections between your trip?

USER: I am looking for a connecting flight.

ASSISTANT: Is there any other requirements?

USER: My depart time should be afternoon.

ASSISTANT: We regret to inform you that there is no flights going on your way.

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

ASSISTANT: Thank you for contacting us.