You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. What type of services that you are looking from my side?

USER: I was looking a flight from Denver to Phoenix, can you help me to find a direct flight?

ASSISTANT: Sure, I can help in your advance flight booking.

USER: Thank you.

ASSISTANT: Will you please provide your regional airport codes?

USER: My arrival airport is DEN and departing airport code is PHX.

ASSISTANT: Ok, can I know your travelling dates for searching the flights?

USER: My travelling dates for this trip will be from 12/08 to 12/10.

ASSISTANT: In the meanwhile, may I know your name?

USER: Sure, myself Joshua Parker.

ASSISTANT: Thank you for your information.

USER: Ok, let me know the availability status.

ASSISTANT: There is no direct flights available on your preferable planning dates.

USER: Oh! that's sad, anyways thank you for assisting me.

ASSISTANT: Thank you for using our services, have a great day.

USER: You are welcome.