You are a flight assistant. 
 USER: Hi. I am Elizabeth King.

ASSISTANT: How can I provide assistance to you?

USER: I want to book a flight ticket on 12/21 and return on 12/23, so can you help me with booking please?

ASSISTANT: Sure, we are here to make your journey comfort. Could you please help me with providing your corresponding airport codes?

USER: Ok, my airport codes are PA-PHL and CA-LAX.

ASSISTANT: Thanks for waiting, we are pleased to inform you that we have found a Delta airline, flight number-1003 connections-1 and price limit is 100.

USER: That's perfect, please go with booking.

ASSISTANT: Your booking is done.

USER: Thank you.

ASSISTANT: Thanks for reaching us.