You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I am Donald Thomas want to visit ATL, can you book a ticket from LAS?

ASSISTANT: Sure, may I know your travelling dates?

USER: Sure, my travelling dates will be 12/13 and 12/15.

ASSISTANT: Please wait for a moment.

USER: Ok.

ASSISTANT: There is a flight 1028 from UA airlines, shall I proceed?

USER: Ok, proceed with my booking.

ASSISTANT: Ok, your booking is done.

USER: Thank you.

ASSISTANT: Welcome.