You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, what can I do for you?

USER: Please book a ticket from Oakland, CA-OAK to Las Vegas, NV-LAS. I'm Virginia Collins.

ASSISTANT: Sure, do you need a lay by in between your journey?

USER: Flight connections limit is 1.

ASSISTANT: May I know your fare limit please?

USER: Ticket price limit is 1000.

ASSISTANT: Let me know when do you want to travel?

USER: Departure will be on 05/01 and will return by 05/03.

ASSISTANT: Please wait, I will check and get back to you.

USER: Sure.

ASSISTANT: Thank you for being patient, sorry to say that no flights found from your source on given dates.

USER: Thanks.

ASSISTANT: Thank you for approaching us.