You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I want to travel from DEN to DFW. Can you help me to book a flight ticket?

ASSISTANT: Sure, we are mirthful to help you. Please help me with your planned trip dates.

USER: I want to fly in the flight on Aug 25 and Aug 27.

ASSISTANT: Do you have any break in between journey?

USER: I want to have a connection of 1.

ASSISTANT: May I know your class preference?

USER: I have changed my decision, I am looking for a direct flight. Please check for that.

ASSISTANT: Can I have your good name please?

USER: I am Rebecca King.

ASSISTANT: Is there any other specifications for you?

USER: I prefer to travel in business class.

ASSISTANT: We are regret to inform you that no flights are available on your desired routes.

USER: That's ok. Anyways, thank you for your help.

ASSISTANT: Thank you for availing us.