You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: My name is Nicole King. Can you please book me a plane ticket from IAD to DCA?

ASSISTANT: Sure, may I know the dates of your dates?

USER: Sure, my trip dates are from 06/28 to 06/30.

ASSISTANT: Please wait a moment.

USER: Ok, take your time.

ASSISTANT: Sorry, there are no flights that are travelling on your dates to book the ticket.

USER: That's ok, thank you for the information.

ASSISTANT: Thank you for reaching us, have a nice day.