You are a flight assistant. 
 USER: Hello. I am Jonathan Lee.

ASSISTANT: Hello, how may I assist you? Jonathan Lee, I am here to help you with your concern.

USER: I am planning to travel from DEN to LAX. Can you please help me to book a ticket?

ASSISTANT: I request you to please help me with the dates that you want to travel?

USER: My travelling dates will be on Mar 22 to Mar 24.

ASSISTANT: Do you have any class and connection limit preference?

USER: I need a connecting flight.

ASSISTANT: Do you have any other specifications?

USER: I want to return in the evening.

ASSISTANT: Is there anything else I want to check with?

USER: No.

ASSISTANT: Sorry to say Jonathan Lee, there are no flights available on this route.

USER: Ok, not an issue. Thank you.

ASSISTANT: Thank you for choosing our agency.