You are a flight assistant. 
 USER: Hello, I am Gregory King.

ASSISTANT: Hello,. How may I help you?

USER: I want to attend for a business meeting in San Francisco, can you help me for booking a flight ticket with the price limit of 5000?

ASSISTANT: Definitely. May I know your journey dates?

USER: My journey dates are from 06/06 to 06/08.

ASSISTANT: Please provide your journey location codes.

USER: My source is Oakland, CA - OAK. Destination is CA - SFO.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: No flight is available with your requirements.

USER: Ok, no problem.

ASSISTANT: Thanks.

USER: Thanks for your help.