You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I am looking to book a flight ticket from MCO to LAS. Can you help me for that?

ASSISTANT: Sure, your travel dates please?

USER: My travelling dates are May 21 and May 23.

ASSISTANT: Any preferences you have?

USER: I prefer to book a business class.

ASSISTANT: Can you mention your name please?

USER: My name is Larry Collins.

ASSISTANT: Sorry, no fights found with your requirements.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for reaching us.