You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I serve you?

USER: Can you please help me in booking a flight tikcet to JFK from DCA?

ASSISTANT: May I know your planned dates to travel?

USER: My travel dates are from Aug 19 to Aug 21.

ASSISTANT: Is there any connection limit?

USER: I need a connecting flight.

ASSISTANT: Any more preferences?

USER: I would like to depart in the afternoon.

ASSISTANT: May I know your good name?

USER: I am George Wilson.

ASSISTANT: There were no flights running currently with your specified dates to travel.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for opting us.