You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: I want to book a flight ticket from IAD to BOS. Could you help me in booking?

ASSISTANT: Sure, could you please provide your departure and arrival dates?

USER: My travelling dates are from Jan 16 - 18.

ASSISTANT: Are you looking for any preferred class?

USER: No.

ASSISTANT: Do you have any other specifications to be met?

USER: I prefer for direct flight.

ASSISTANT: May I know your name?

USER: Linda Turner here.

ASSISTANT: Ok, please wait.

USER: Ok.

ASSISTANT:  Thank you for your valuable time, unfortunately no flights available on that route.

USER: That's ok, thank you.

ASSISTANT: Thank  you for reaching us.