You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

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

ASSISTANT: Sure, will you mention your travelling dates please?

USER: Sure, I want to travel on June 21 and need to return on June 23.

ASSISTANT: Do you have any preferences about flight connections?

USER: I am looking for a flight with single connection.

ASSISTANT: Do you have any preferences about class?

USER: No.

ASSISTANT: Please mention your name.

USER: I am Jacob Baker.

ASSISTANT: The Hawaiian airlines providing a direct flight with price 100. The class is economy. Shall I confirm your ticket?

USER: Ok, please confirm.

ASSISTANT: Your ticket is booked. The flight number is 1020.

USER: Thank you.

ASSISTANT: Welcome, have a great day.