You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, How may I assist you today?

USER: I am Mark Davis.

ASSISTANT: Ok.

USER: Will you be my helping hand to book my flight ticket from New York, IAD to attend an interview?

ASSISTANT: Sure, I will help you in booking.

USER: Thank you.

ASSISTANT: Can you share your reaching point?

USER: Washington, DCA is my destination airport.

ASSISTANT: I would like know about travel dates, to check flights.

USER: 04/09 - 04/11 are my willing dates to travel.

ASSISTANT: Thanks for sharing your details, unfortunately no flights run in this route.

USER: Ok, I will choose other airline. Thank you.

ASSISTANT: Thank you for choosing us, Have a nice day.