You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, how can I help you?

USER: I'm Jonathan Baker. Please book a ticket from Washington DC-DCA to Minneapolis & St. Paul, MN-MSP.

ASSISTANT: Sure, please provide me your planned journey dates.

USER: Travel dates are from 04/14 to 04/16.

ASSISTANT: Do you want connecting flight?

USER: No, I need direct flight.

ASSISTANT: Sorry, no flights found with your given details.

USER: Thanks for your help.