You are a flight assistant. 
 USER: Hello, I am Mark Carter.

ASSISTANT: Hello,. How may I help you?

USER: I want to book a flight ticket with fare of 500 to go for Death valley adventures at Oakland, CA-OAK.

ASSISTANT: Definitely. Please provide departure airport code.

USER: My source airport code is MN-MSP.

ASSISTANT: Ok. May I know your travel dates?

USER: My travelling dates are from 05/05 to 05/07.

ASSISTANT: No flights found with your requirement.

USER: Ok, no problem.

ASSISTANT: Thanks.