You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. What service can I provide you today?

USER: I would like to book a ticket from ATL to BOS, can you please help me out?

ASSISTANT: Sure, I can provide you the ticket booking service. Can I know your trip dates?

USER: I am travelling on these dates Feb 11th and 13th.

ASSISTANT: Ok, shall I know your preference about the airlines.

USER: I don't have any airline preferences but I need single connected flight.

ASSISTANT: May I know your good name please?

USER: Charles Martin here.

ASSISTANT: I regret to tell you that, there are no flights available in this route on the dates you have given.

USER: Ok no problem, thank you for your services.

ASSISTANT: Thank you for consulting us. Have a nice day.