You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you for the day?

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

ASSISTANT: When you are willing to travel?

USER: My travelling dates are July 26 and July 28.

ASSISTANT: Do you have any class preference?

USER: I am comfortable with any class.

ASSISTANT: Can you help me with your airport codes?

USER: My airport codes are PHX and ATL.

ASSISTANT: May, I know your good name?

USER: My name is Michael Campbell.

ASSISTANT: Do you have any connection limit?

USER: I need single connecting flight.

ASSISTANT: Sorry, we found no flights on your given dates.

USER: Anyway, thanks for the information.