You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: Jack Evans here. I want to meet by business partner in casino, so please book my ticket from DEN to LAS.

ASSISTANT: Sure, may I know your planned travel dates please?

USER: My planned dates of travel are 02/02 and 02/04.

ASSISTANT: Sorry for the inconvenience, there is no flight available on your requested dates.

USER: No problem, thank you.

ASSISTANT: Thank you for approaching us.