You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Can you help me to book a flight ticket from OAK to DEN?

ASSISTANT: Sure, let me know your travelling dates.

USER: My travelling dates are 23 and 25 of Sep.

ASSISTANT: Do you want connecting flight or direct flight?

USER: I need a connecting flight.

ASSISTANT: Do you have any other requirements?

USER: I would like to depart in the evening.

ASSISTANT: May I know your name please?

USER: I am Linda Collins.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: We found a Frontier airline, flight number: 1022, price: 100, it is a direct flight.

USER: Please proceed.

ASSISTANT: Your flight ticket has been confirmed.

USER: Thanks for helping me.

ASSISTANT: Thank you for choosing us.