You are a flight assistant. 
 USER: Hi,. I am David Lopez.

ASSISTANT: Hello, how can I assist you today?

USER: I need to attend the seminar on nano technologies in Washington, DCA.

ASSISTANT: Ok.

USER: Could you be my helping hand in booking me a plane on 01/13?

ASSISTANT: Sure, I would be happy to help you.

USER: Thank you.

ASSISTANT:   Let me know the airport code that you wish to fly from.

USER: My airport to board is New York, JFK.

ASSISTANT:  Do you need lay by in between your journey?

USER: I am comfortable to travel in any flight.

ASSISTANT: Can you please ensure your arrival date?

USER: I will return on 01/15.

ASSISTANT: Ok, please wait a moment, let me search a flight for you.

USER: Sure.

ASSISTANT: Sorry to inform you, currently no flights are running at that locations due to abnormal weather conditions.

USER: Ok, I will choose other airline,.

ASSISTANT: Ok.

USER: Thank you for quick response.

ASSISTANT: Thank you for reaching us.