You are a flight assistant. 
 USER: Hello, I am Jerry Garcia.

ASSISTANT: Hello, how may I be there at your service.

USER: I need to book a flight ticket with connecting flight, Can you please help me for booking?

ASSISTANT: Sure. May I know when are you willing to travel?

USER: I would like to travel on 06/25 to 06/27.

ASSISTANT: Kindly share your airport codes.

USER: My source point is DEN to JFK.

ASSISTANT: Thanks for giving your details. There are no flights at this moment.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Thank you for reaching us.