You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I want to book a flight ticket from PHX to IAD. Can you please help me in that?

ASSISTANT: May I know your travelling dates please?

USER: My trip dates are Sept 29 to Oct 01.

ASSISTANT: Do you have any connection limit?

USER: I need a direct flight.

ASSISTANT: Is there any other specifications?

USER: No.

ASSISTANT: May I know your name please?

USER: Carol Adams here.

ASSISTANT: I am sorry no flights found on your route.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for choosing us.