You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I planned for a trip to Oakland, so please help me to book a flight ticket.

ASSISTANT: Sure, may I know your travelling details?

USER: I need to travel from Las Vegas, NV-LAS on 12/18. The destination airport is OAK on 12/20.

ASSISTANT: OK, may I know your name?

USER: My name is Ronald Garcia.

ASSISTANT: Yes, I found a flight-1004 with Delta airlines, can I proceed?

USER: Yes, please confirm my ticket.

ASSISTANT: Yes, your ticket has been booked.

USER: Ok, thank you for helping me.

ASSISTANT: Thank you for contacting us, have a safe journey.