You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Please book a ticket from DFW to BOS to attend Cultural festival.

ASSISTANT: Sure, to book a ticket may I know your planned trip dates?

USER: My travelling dates are June 13 and June 15.

ASSISTANT: Do you have any other specifications?

USER: I want single connected flight.

ASSISTANT: Please provide your name.

USER: I am Kenneth Harris.

ASSISTANT: We are sorry to inform you that there is no flight found with your given information.

USER: Ok, Thank you.

ASSISTANT: Thank you.