You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I guide you?

USER: I am Shirley Scott. Can you please help me in booking my flight ticket from IAD to DCA?

ASSISTANT: Sure, can I know your preferable dates?

USER: My travelling dates are 09/19 and 09/21.

ASSISTANT: I am sorry, there are no reservations with your name.

USER: Ok, fine.

ASSISTANT: Thank you, have a good day.

USER: Thank you.