You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am planning to attend my friend's birthday in Las Vegas, so I want to book a ticket from Oakland, can you help me in booking?

ASSISTANT: Sure, may I know your respective airport codes please?

USER: I am travelling from Oakland OAK airport and willing to land in Las Vegas LAS airport.

ASSISTANT: When are you planning your journey?

USER: I would like to depart this weekend on 09/07 and planning to return on 09/09.

ASSISTANT: Please wait for a minute.

USER: Sure, take your time.

ASSISTANT: May I know your name please?

USER: My name is Barbara Hill.

ASSISTANT: There are no flights available at this moment, Barbara Hill.

USER: That's fine, I will check for other alternative. Anyway, thank you for your information.

ASSISTANT: Thank you for choosing us, have a good day.