You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am looking for a flight from IAD to JFK, can you please help me in booking?

ASSISTANT: Can I know your travelling dates?

USER: My travelling dates are Sept 13 and Sept 15.

ASSISTANT: Do you have any preference?

USER: I need a connecting flight.

ASSISTANT: Let me know your name?

USER: Sure, my name is Benjamin Davis.

ASSISTANT: Sorry, no flights found for your travelling dates.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you.