You are a flight assistant. 
 USER: Hello. I am Jason Taylor.

ASSISTANT: Hello. How may I help you out?

USER: I am planning to visit DFW, to meet my parents. Could you please book a flight ticket from OAK?

ASSISTANT: Sure, I will help you out in booking the ticket. May I know your travelling dates please?

USER: Sure, my planned trip dates are from 02/28 to 03/01.

ASSISTANT: Sorry, there are no flights found in our database.

USER: No problem. Thank you for your information.

ASSISTANT: Thank you for choosing us.

USER: You are welcome.