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

ASSISTANT: Hello, how can I help you today?

USER: Can you please help me to book a flight ticket form LAX to MSP?

ASSISTANT: Sure, please share your planned trip dates?

USER: My trip dates are Dec 13 to Dec 15.

ASSISTANT: Let me know your connection limit?

USER: I need a flight with single connection.

ASSISTANT: Any other requirements to be met?

USER: I want to return in the evening.

ASSISTANT: Any class preference?

USER: No, I am comfortable with any class.

ASSISTANT: Sorry to notify you that, currently no flights are running  on this route.

USER: No problem, thanks for your information.

ASSISTANT: Thank you for reaching us.