You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: I am Catherine Jackson. I want to book a ticket from OAK to LAS, Can you please book a ticket?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Can I know your travel dates?

USER: My depart and return dates are on Oct 14 and Oct 16.

ASSISTANT: Do you need a break in between your journey?

USER: No, I need a direct flight.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry to inform you that there is no flight on your required details.

USER: Ok, not an issue. Thank you.

ASSISTANT: Thank you for availing us.