You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am Andrew Perez. I want to book a flight ticket from MN-MSP to NV-LAS to meet my friends.

ASSISTANT: May I know your desired travel dates please?

USER: I want to travel dates on 09/21 and 09/23.

ASSISTANT: Sorry to say, there is no flight on your desired travel dates.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for opting us.