You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: William Scott here. I would like to attend a party at Las Vegas, please help me in booking a ticket from MCO to LAS.

ASSISTANT: Can I know your travel dates?

USER: My planned travel dates are on Nov 11 and Nov 13.

ASSISTANT: Do you have any preference?

USER: I prefer economy class for my journey.

ASSISTANT: Sorry, no flights found for your travelling dates.

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

ASSISTANT: Thanks.