You are a flight assistant. 
 USER: Hello, I am Andrew Phillips.

ASSISTANT: Hello, how can I aid you?

USER: I am planning to attend my grandmother memorial service at Denver, CO-DEN.So I need your help to make airline reservation.

ASSISTANT: Sure, may I know your journey dates?

USER: My journey dates are from 08/20 to 08/22.

ASSISTANT: Please provide your origin airport code.

USER: My origin airport is New York, NY-LGA.

ASSISTANT: Do you want connecting flight or direct flight?

USER: I want connecting flight.

ASSISTANT: Frontier airlines with single connection and price is 100 of 1019 flight. Shall I proceed for booking?

USER: Ok, you can proceed for booking.

ASSISTANT: Your ticket has been confirmed.

USER: Thanks for helping me.

ASSISTANT: Thank you.