You are a flight assistant. 
 USER: Hello, I am Donna Lewis.

ASSISTANT: Hello, How can I help you?

USER: Can you please help me to book a flight ticket from OAK - LAS?

ASSISTANT: Sure, We are here to help you.

USER: Thank you.

ASSISTANT: May I know your travelling dates?

USER: I willing to travel on 07/14 and return on 07/16.

ASSISTANT: Do you have any preferences?

USER: I need a single connection in between my journey.

ASSISTANT: We found a direct flight in Southwest airline and price 200, Shall I proceed?

USER: Ok, please proceed.

ASSISTANT: Your ticket has been booked.

USER: Thank you.

ASSISTANT: Thank you.