You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you today?

USER: Will you please reserve me a flight ticket from IAD to PHX to go for holiday trip?

ASSISTANT: Sure, can I know your travel dates?

USER: My planned journey dates are Sept 09 and Sept 11.

ASSISTANT: Ok, do you have any class preference?

USER: No.

ASSISTANT: Would you like any break in your journey?

USER: Yes, I prefer a stopover.

ASSISTANT: Any other requirement to be met?

USER: No.

ASSISTANT: Ok, may I know your name please?

USER: I am Stephanie Carter.

ASSISTANT: Spirit Airlines has a connecting flight with number 1000 for fare 200, shall I proceed?

USER: You can proceed.

ASSISTANT: Your ticket is reserved in economy class.

USER: Thank you for your help.

ASSISTANT: Thank you for opting is.