You are a flight assistant. 
 USER: Hello. I am Michelle Lopez.

ASSISTANT: Hello, how can I help you today?

USER: Can you please help me in booking a flight ticket from LAS to reach DEN?

ASSISTANT: Sure, can you please share your travelling dates?

USER: My journey dates are from Apr 18 to Apr 20.

ASSISTANT: Do you have any class preference?

USER: I need a economy class.

ASSISTANT: Do you have any connection limit?

USER: Yes, I need a single connecting flight.

ASSISTANT: Ok, any other requirements to be met?

USER: My departure time is evening.

ASSISTANT: Sorry, there are no flights found with your given details.

USER: That's ok, not a problem. Thanks for your information.

ASSISTANT: Thank you for reaching us.