You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello,. How shall I assist you?

USER: I'm planning to go for LGA  for convocation, can you book my ticket from OAK?

ASSISTANT: Sure.

USER: My trip dates are 02/28 and 03/01. Can you please make sure that I want to to travel in direct flight.

ASSISTANT: May I know your name?

USER: Myself Stephen Parker.

ASSISTANT: Please wait for a while.

USER: Ok.

ASSISTANT: I am sorry, there is no direct flight.

USER: Ok,fine. Thank you for your help.

ASSISTANT: Thanks.