You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello,. How may I assist you?

USER: I am Jonathan Campbell.

ASSISTANT: Ok.

USER: Please book a flight ticket to Denver for visiting flower festival.

ASSISTANT: Sure. Please let me know your journey dates?

USER: 04/25 and 04/27 are my travelling dates.

ASSISTANT: Please specify airport codes?

USER: LAX is my source and DEN is my destination.

ASSISTANT: Ticket can be booked with flight connections 1 for price 100. Airline is Spirit having flight number 1019. Shall I book a ticket?

USER: Yes, please.

ASSISTANT: Your ticket to Denver is booked.

USER: Thanks for booking my ticket.

ASSISTANT: Thanks.