You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, how may I help you?

USER: Please book a ticket from Washington DC-DCA to Austin, TX-AUS for arts and crafts festival.

ASSISTANT: Sure, may I know your travel dates?

USER: My departure date is 09/26 and 09/28 is my return date.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Sorry, there were no flights found on your specified dates.

USER: I am Emily Allen. Thanks for the help.

ASSISTANT: Thank you.