You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you out?

USER: Can you please help me to reserve a plane ticket from Denver to Los Angeles?

ASSISTANT: Sure, I will help you in booking the ticket. May I know your travelling dates please?

USER: Thank you. My travel dates are May 21 and May 23.

ASSISTANT: Can I know your airport codes too?

USER: The source and destination airport codes are DEN and LAX.

ASSISTANT: Do you need any specifications in airlines?

USER: No but I prefer a single connecting flight to travel.

ASSISTANT: There is a direct flight with connection 0 and price 100, can I proceed?

USER: Yes, please proceed with the ticket booking with the name Nicole Taylor.

ASSISTANT: Ok, your ticket has been booked with flight number 1020.

USER: Thanks a lot for your help in reserving the ticket.

ASSISTANT: Thank you for reaching us.

USER: Most welcome.