You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: My name is Benjamin Carter and I want to book the flight ticket from DFW to BOS. Can you please help me?

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

USER: My travel dates are Sept 20 and Sept 22.

ASSISTANT: Do you have any specifications?

USER: I would like to depart in the afternoon.

ASSISTANT: May I know your name?

USER: Benjamin Carter.

ASSISTANT: Ok, please wait a minute.

USER: Sure.

ASSISTANT: Sorry, there were no flights found on your route.

USER: Ok, thank you for the information.

ASSISTANT: Thank you.