You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: Andrew Scott here. Could you please book a ticket from BOS to DCA.

ASSISTANT: Sure, can I know the dates of travel?

USER: I am travelling on 08/24 to 08/26. Make sure the connection limit is 0.

ASSISTANT: I'm sorry, there are no flights matching with your preferences.

USER: That's fine, thanks for your help.

ASSISTANT: Thank you, have a good day.