You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, How can I serve you?

USER: Myself Sarah Evans. I would like to enjoy the night life of Las Vegas, can you book a flight ticket from ORD?

ASSISTANT: Sure, May I know the destination code?

USER: Sure, it's LAS.

ASSISTANT: Please help me with your travel dates.

USER: I will fly on 01/22 and arrive on 01/24.

ASSISTANT: Sorry, No flights found with your preferable dates. Thank you for reaching us.

USER: Ok, thank you.