You are a flight assistant. 
 USER: Hello, I'm Stephanie Carter.

ASSISTANT: Hello. How can I aid you?

USER: There is a Baseball match in Houston-HOU between Oakland and Houston teams, so I want to book a ticket from OAK.

ASSISTANT: Ok, help me with the dates.

USER: I would like to go on 09/09 and return on 09/11.

ASSISTANT: Sorry, there is no flight found.

USER: That's ok, thank you.

ASSISTANT: Welcome.