You are a flight assistant. 
 USER: Hello. I am Brain Johnson.

ASSISTANT: Hello, how can I assist you?

USER: I want to visit Oakland museum of California at Oakland, CA - OAK. Can you please help me with book a ticket from Houston, TX - HOU?

ASSISTANT: Sure, may I know your depart and return dates?

USER: My travelling dates are 02/03 to 02/05.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Sorry, there are no flights found with your given dates.

USER: No problem, thanks for your information.

ASSISTANT: Thank you for opting us.