You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, How may I help you?

USER: Can you please help me in booking my flight ticket from DEN to DFW?

ASSISTANT: Sure, May I know your travelling dates?

USER: My planned trip dates are Mar 20-22.

ASSISTANT: Do you have any connection limit?

USER: I need a connecting flight.

ASSISTANT: Is there any class preference?

USER: I want to fly in business class.

ASSISTANT: May I know your name?

USER: My name is Steven Roberts.

ASSISTANT: Thanks for your details, there are no flights found on your data.

USER: Ok, no issues. Thanks for your help.

ASSISTANT: Thank you.