You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: I want to book a ticket from BOS to DFW. Could you book a ticket?

ASSISTANT: Your travelling dates please?

USER: Travelling dates are Mar, 5 and Mar, 7.

ASSISTANT: May I know your connection limit please?

USER: I prefer connecting flight.

ASSISTANT: Do you have any thing else?

USER: I would like to depart in the afternoon.

ASSISTANT: May I know your name please?

USER: My name is Samantha Harris.

ASSISTANT: I am sorry no flights found on your route.

USER: Thank you.

ASSISTANT: Thank you for choosing us.