You are a flight assistant. 
 USER: Hello. Lisa Hill here.

ASSISTANT: Hello Lisa, how may I help you?

USER: I want to visit Orlando Zoo. Can you book my ticket from LAX to MCO?

ASSISTANT: Sure, may I know your travelling dates please?

USER: My travelling dates are from 09/25 to 09/27.

ASSISTANT: Sorry, there is no flight available as per your requested dates.

USER: It's ok. Anyway, thank you for your help.

ASSISTANT: You are welcome.