You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I help you?

USER: I am looking for a flight from OAK to DEN, can you help me in booking?

ASSISTANT: Sure, May I know your travelling dates?

USER: Sure, my planned travel dates are May 07 and May 09.

ASSISTANT: Do you have any connection limit?

USER: Yes, please look for a connecting flight.

ASSISTANT: Any other preferences?

USER: I prefer for an economy class for a normal-cost airlines.

ASSISTANT: May I know your name?

USER: Myself John Lewis.

ASSISTANT: You have a connecting flight 1000 in UA airlines and price 200, Shall I proceed?

USER: That's fine, please proceed with booking.

ASSISTANT: Your ticket has been booked.

USER: Thank you for the service.

ASSISTANT: Thank you.