You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: Can you help me to book a flight ticket from JFK to DCA?

ASSISTANT:  Sure, I will help you in booking the ticket. May I know your travelling dates please?

USER: I will start on Nov, 10 and return on Nov, 12.

ASSISTANT: Do you need any connection limit?

USER: I would prefer single connection.

ASSISTANT: Do you have any other specifications?

USER: No.

ASSISTANT: May I know your name?

USER: Joshua Collins here.

ASSISTANT: There are no flights available on your routes.

USER: Not a problem, thank you for the information.

ASSISTANT: Thank you for choosing us.