You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I want to meet my friend in Las Vegas, could you book my ticket from LAX to LAS?

ASSISTANT: Sure, I will help you out. May I know your travelling dates please?

USER: My travel dates are 08/01 and 08/03.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Sorry, there are no flights.

USER: No problem, thank you for helping me.

ASSISTANT: May I know your name please?

USER: Stephen Parker here.

ASSISTANT: Thank you for reaching us.