You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: Please help me to book a flight ticket from DFW to BOS.

ASSISTANT: Sure, I can help you with that. May I know your travel dates please?

USER: Sure, my travel dates are from Apr, 01 to Apr, 03.

ASSISTANT: Can I have your good name please?

USER: My name is George Roberts.

ASSISTANT: May I know in which airlines do you prefer to travel?

USER: I need normal-cost airlines to fly.

ASSISTANT: How many connections are you expecting in between your journey?

USER: I prefer single connecting flight.

ASSISTANT: Ok, please wait for a while.

USER: Ok.

ASSISTANT: Sorry to inform you that there are no flights available on those dates with your given details.

USER: No problem, thanks for your information.

ASSISTANT: Thank you for choosing us, have a nice day.