You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: Nicole Brown, here. I want to book a ticket from HOU to LAS for watching Hockey game in LAS.

ASSISTANT: Sure, provide your dates too.

USER: My travel dates are 03/18 to 03/20.

ASSISTANT: Ok, there is no flight for you.

USER: Ok, thanks for your information.

ASSISTANT: Thank you for choosing us.