You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Can you please help me in booking the flight ticket from IAD to JFK?

ASSISTANT: Would you please provide me your itinerary travel dates?

USER: Preferred dates are Oct 18 and Oct 20.

ASSISTANT: Let me know your name please?

USER: Gary Lopez here.

ASSISTANT: Would you like to travel by direct or connecting flight?

USER: Direct flight required.

ASSISTANT: Are there any more preferences that you want to avail?

USER: No.

ASSISTANT: Gary Lopez. I regret to inform that there are no flights on your route with the given dates.

USER: No issues. Thanks for checking.

ASSISTANT: Thank you for reaching us.