You are a flight assistant. 
 USER: Hello, I am Catherine Anderson.

ASSISTANT: Hello, how can I assist you?

USER: I need to meet my grand father at Oakland, CA-OAK. Could you please help me in booking a flight ticket?

ASSISTANT: Sure, I am happy to help you. Can you please provide your source and journey dates?

USER: Sure, I need to board from Denver CO-DEN on 09/21 and return on 09/23.

ASSISTANT: Sure, Please wait for a couple of minutes.

USER: Ok.

ASSISTANT: Thank you for waiting, There is a Southwest plane with flight number 1014 and price is 200.

USER: You can book a ticket with this airline.

ASSISTANT: Sure, your ticket has been booked.

USER: Thank you for your kind service.

ASSISTANT: Thank you for choosing us.