You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I am planning to visit Korean war veterans memorial at Washington, IAD. So please book me a flight ticket from OAK.

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

USER: My trip dates are from June 26 to June 28.

ASSISTANT: Do you have any connection limit?

USER: I need a break in between journey.

ASSISTANT: May I know your arrival and depart timings?

USER: My return time is morning.

ASSISTANT: Is there any airline preference?

USER: I prefer to travel in only normal cost airline.

ASSISTANT: Please be on hold.

USER: Sure.

ASSISTANT: Sorry, there are no flights found on your specified routes.

USER: Ok, that's not a problem.

ASSISTANT: May I know your good name?

USER: My name is Nicholas Lewis.

ASSISTANT: Thank you for availing us.

USER: Thank you.