You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I would like to travel from DCA to ATL for my trip. Can you please help me in ticket booking?

ASSISTANT: Sure, may I know your trip dates please?

USER: My trip dates are from 05/29 to 05/31.

ASSISTANT: Do you have any airline preference?

USER: I am comfortable with normal cost airlines.

ASSISTANT: Ok, do you have any other requirements?

USER: Yes, I want to book my tickets in business class with 1 connection.

ASSISTANT: Sorry, we regret to inform you that there is no flight available as per your request.

USER: It's ok, thank you.

ASSISTANT: Can I know your name please?

USER: Myself Anna Young.

ASSISTANT: Thank you.