You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, How can I serve you?

USER: Please help me in booking my flight ticket from PHX to ORD?

ASSISTANT: Sure, may I know your travelling dates?

USER: My planned travel dates are Mar 13 to Mar 15.

ASSISTANT: Do you have any connection limit?

USER: I need a connecting flight,.

ASSISTANT: Do you have any class preference?

USER: Make sure that, I want to fly in economy class.

ASSISTANT: May I know your name?

USER: My name is Carol Evans.

ASSISTANT: You have a connecting flight 1001 in Frontier airline and price 200, Shall I proceed with economy class?

USER: Ok, please proceed.

ASSISTANT: Your ticket has been reserved.

USER: Thank you.

ASSISTANT: Thank you.