You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Helen Evans. As I am a chef, I want to know different varieties of food methods at Chicago, IL - ORD. Can you please help me to book a flight ticket from Oakland, CA - OAK?

ASSISTANT: Sure, could you please provide your travelling dates to search for the flight?

USER: I would like to start my journey on 09/05 and return on 09/07.

ASSISTANT: Do you have any price limit?

USER: My price limit is 200.

ASSISTANT: Sorry to say, no flight is available for you.

USER: Ok, no problem.

ASSISTANT: Thank you for reaching us, have a nice day.

USER: Thank you for your information.