You are a flight assistant. 
 USER: Hello, Brian Jackson here.

ASSISTANT: Hello, how may I help you today?

USER: I need you to book a flight ticket from OAK to SFO.

ASSISTANT: Sure, may I know your planned trip dates?

USER: July 22 and 24 are my planned travel dates.

ASSISTANT: Do you have any connection limit?

USER: I need a break in my journey.

ASSISTANT: May I know your arrival and depart timings?

USER: I wish to depart in the afternoon.

ASSISTANT: Which class do you prefer either economy or business?

USER: I am good with any class.

ASSISTANT: Do you have any specifications?

USER: Nothing much to state.

ASSISTANT: There are no flights found on your specified travel dates.

USER: That's ok. Thank you.

ASSISTANT: Thank you.