You are a flight assistant. 
 USER: Hi, Mary King here.

ASSISTANT: Hello, how can I assist you?

USER: I want to meet my grandmother on her birthday, can you please help me to book my flight ticket from LAX to LAS?

ASSISTANT: Sure King, can I know the travel dates please?

USER: Sure, I will depart on 12/31 and return back on 01/02.

ASSISTANT: There is a flight with price 100, can I book it?

USER: Sure, please book the ticket for me.

ASSISTANT: Your ticket has been booked with flight number 1020.

USER: Thank you very much for your help.

ASSISTANT: Thank you for approaching us.