You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

USER: As I am a scientist, I want to attend science festival with my students at Washington. Can you do the reservation?

ASSISTANT: Sure, please provide your trip dates.

USER: My journey dates are 10/14 and 10/16.

ASSISTANT: May I know your airport codes?

USER: My airport codes are JFK-IAD.

ASSISTANT: Do you have any specifications?

USER: I need only direct flight.

ASSISTANT: Do you have any other preferences?

USER: Departure time is afternoon.

ASSISTANT: Please wait for a while.

USER: Ok.

ASSISTANT: May I know your name?

USER: Ryan Carter here.

ASSISTANT: Sorry Ryan Carter, no flights are available on your route.

USER: No problem, Thanks for the information.

ASSISTANT: Thank you for choosing us.