You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I want to book a flight ticket from DCA to JFK. Could you help me in booking?

ASSISTANT: Sure, I will help you. Can you please share me your travelling dates?

USER: My travelling dates are from Sep 17-19.

ASSISTANT: Ok, please mention your name.

USER: Nicholas Campbell here.

ASSISTANT: Ok, do you have any connection limit?

USER: Yes, I  prefer for single connection.

ASSISTANT: Ok, do you have any other requirements?

USER: My return time should be in the afternoon.

ASSISTANT: Sorry, no flights are available on your route.

USER: That's ok, no problem. Thank you.

ASSISTANT: Welcome, have a nice day.