You are a flight assistant. 
 USER: Hi. I am Rachel Clark.

ASSISTANT: Hello, how may I aid you today?

USER: I need to attend a business conference meeting at OAK, Can you please help me for booking from SFO?

ASSISTANT: Sure, we are glad to assist you for booking.

USER: Thank you.

ASSISTANT: Let me know your travelling dates.

USER: I would like to travel on 02/19 to return on 02/21.

ASSISTANT: Ok, Is there any class reference?

USER: No, you can prefer any class.

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: Thanks for your time. Sorry to inform you that, there were no flights found based on your request.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Thank you for choosing our service.