You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Justin Thomas here.

ASSISTANT: How can I assist you today?

USER: I want to visit my Grandmother's house in the month of March, will you please help me in booking my ticket from IAD to DEN?

ASSISTANT: Sure, could you please provide your preferable travel dates?

USER: My preferable travelling dates are from 03/28 to 03/30.

ASSISTANT: Ok, let me check for the availability of flight.

USER: Ok.

ASSISTANT: Justin, there is a flight available with price 100 and the airline is AA. Would you like me to proceed the booking?

USER: Yes, please proceed with the booking.

ASSISTANT: Your booking is confirmed with 1020 flight number.

USER: Thank you.

ASSISTANT: You are welcome. Thank you for choosing our service.