You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am Patrick Perez, I want to book a flight ticket from SFO to DCA in the month of September.

ASSISTANT: On which date you like to travel?

USER: My travelling dates are 09/10 and 09/12.

ASSISTANT: There is direct flight, can I proceed for booking?

USER: No, please do not book this flight. Anyway thank you for the help.

ASSISTANT: Most welcome.