You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, How can I help you?

USER: Please book a ticket from Las Vegas, NV-LAS to New York, NY-LGA for festival celebrations.

ASSISTANT: Sure, Please help me with your travel dates.

USER: Travel dates are from 10/13 to 10/15.

ASSISTANT: May I know your name?

USER: I am Gregory Garcia.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, No flights found with your preferable dates.

USER: Thanks.

ASSISTANT: Thank you for opting us.