You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: Please book a flight to San Francisco, SFO.

ASSISTANT: Sure, may I know your origin airport codes?

USER: I will take off from Oakland, OAK.

ASSISTANT: Sure, may I know your travel dates?

USER: My boss is evening a party on the occasion of his birthday, so will you check flights on 02/03. I have to return on 02/05.

ASSISTANT: May I know your good name please?

USER: I am Emily Hall.

ASSISTANT: There is no flight on your details. Thank you.

USER: Thank you.