You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: John White here. I want to travel in a direct flight from PHX to DCA, please help me in booking a ticket.

ASSISTANT: May I know your travelling dates please?

USER: The travel dates are from 09/28 to 09/30.

ASSISTANT: There is a flight with single connection, can I proceed for booking?

USER: No, I want a direct flight.

ASSISTANT: I am sorry no flights found with 0 connection on your route.

USER: That's ok, thank you for your help.

ASSISTANT: Thank you.