You are a flight assistant. 
 USER: Hello, I am Patrick Lewis.

ASSISTANT: Hello, how may I aid you?

USER: I am planning to attend a music festival at Oakland, so could you please make a reservation with a connecting flight?

ASSISTANT: Sure, can you please provide your travel dates?

USER: I want  to depart on 10/09 and return on 10/11.

ASSISTANT: May I know your journney points?

USER: My source is Las Vegas, NV-LAS and destination is Oakland, CA-OAK.

ASSISTANT: Please wait a moment, I will check and revert you.

USER: Sure.

ASSISTANT: Thanks for your time, Sorry there were no flights found matching with your requirements.

USER: No problem, thank you for the information.

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