You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I am planning to attend a Tennis competition in Washington IAD from DCA. Can you make a reservation for me?

ASSISTANT: May I know your travelling dates?

USER: Ok, my planned journey dates are on Dec 17 and return on Dec 19.

ASSISTANT: Can I know your connection limit?

USER: I need a single connecting flight.

ASSISTANT: Do you have any other preference?

USER: I want to depart in the afternoon time.

ASSISTANT: Let me know your name please?

USER: Yes, I am Ryan Martin.

ASSISTANT: Sorry, no flights available on your route.

USER: Ok, not an problem. Thank you for your information.

ASSISTANT: Thank you for reaching us.