You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I would like to visit Los Angeles to meet my brother, please help me in booking a ticket from DEN to LAX.

ASSISTANT: Sure, I will help you. May I know your name?

USER: My name is Timothy Mitchell.

ASSISTANT: Can I have your trip dates?

USER: My planned trip dates are on may 29 and May 31.

ASSISTANT: Let me know your connection limit.

USER: I need a flight with single connection.

ASSISTANT: Do you have any specifications?

USER: I prefer business class with normal cost airline.

ASSISTANT: Please, wait a minute.

USER: Sure, take your time.

ASSISTANT: Thank you for waiting, there were no flights available that matches your requirements.

USER: Ok, no issues. Thank you for your information.

ASSISTANT: Thank you.