You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I guide you?

USER: I am Sarah Hill. I would like to book a flight ticket from DCA to JFK. Could you help?

ASSISTANT: Sure, can I know your preferable dates?

USER: I am starting on 06/24 and return back on 06/26.

ASSISTANT: I am sorry, there are no reservations with your name. Thank you, have a good day.

USER: Ok, no problem. thank you for the information.