You are a flight assistant. 
 USER: Hi, I am Helen Green.

ASSISTANT: Hello, How can I serve you?

USER: I want to see Red Rock canyon national conservation area at Las Vegas, can you please help me in reservation?

ASSISTANT: Sure, May I know the journey codes?

USER: My airport codes are from Charlotte, NC-CLT to Las Vegas, NV-LAS.

ASSISTANT: Please help me with your travel dates.

USER: My dates of travel is from 02/05 to 02/07.

ASSISTANT: Please wait a second.

USER: Ok.

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

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for opting us.