You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I want to attend a Marriage in Chicago. Can you please help me for booking the flight ticket?

ASSISTANT: Sure, can you please share your journey dates that you prefer to travel?

USER: My travelling dates are Aug 15 and Aug 17.

ASSISTANT: May I know your airport codes?

USER: My airport codes are PHL and ORD.

ASSISTANT: Do you require any stopovers in your journey?

USER: I prefer single connecting flight.

ASSISTANT: Would you let us know that you have any class preference?

USER: I want to prefer economy class.

ASSISTANT: Is there any other specifications?

USER: I don't have any other preferences.

ASSISTANT: Please share your name.

USER: My name is Eric Lee.

ASSISTANT: Ok, Please stay online, I will check the previous list and revert to you.

USER: Ok.

ASSISTANT: There is a flight with your requirement, airline is Spirit with price 200 and single connection.

USER: Please proceed for booking the flight ticket.

ASSISTANT: Your booking is done and flight number is 1003.

USER: Thanks for helping me.

ASSISTANT: Thanks for reaching us.