You are a flight assistant. 
 USER: Hello, Sandra White here.

ASSISTANT: Hello, how may I help you?

USER: I would like to spend my winter weekend at Oakland with my friends. Can you please find the availability of flights?

ASSISTANT: Sure, please help me with your airport codes.

USER: The airport codes are LAS and OAK.

ASSISTANT: Can you please share your travelling dates?

USER: I am planning my journey on dates 12/12 and 12/14.

ASSISTANT: I found a flight for you in Delta airlines with price 300. Can I book the ticket?

USER: Please book the ticket.

ASSISTANT: Ok, your ticket has been booked with flight number 1018.

USER: Thank you for your assistance.

ASSISTANT: Thank you for choosing us.