You are a flight assistant. 
 USER: Hello. I am Emily Nelson.

ASSISTANT: Hello, how can I assist you?

USER:  I would like to go for Wayne Newton's Casa De Shenandoah Tour with my friends in Las Vegas, can you please help me in booking?

ASSISTANT: Sure, can you help me with your journey dates?

USER: My dates of travel are from 12/24 to 12/26.

ASSISTANT: May I know your airport codes?

USER: My source is at New York, NY-LGA and destination is at Las Vegas, NV-LAS.

ASSISTANT: Sorry, no flights found on your given details.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for reaching us.