You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Gary Johnson.

ASSISTANT: How can I help you?

USER: I have to attend a Live Concert at Detroit, could you please help me with booking a flight ticket from JFK to DTW?

ASSISTANT: May I know your travelling dates?

USER: I would like to depart on July 9th and return on July 11th.

ASSISTANT: Do you have any class preferences?

USER: I need a flight ticket in business class.

ASSISTANT: Do you have any connection limit?

USER: I am looking for a connecting flight.

ASSISTANT: Do you have any other requirements?

USER: Make sure that my depart time must be evening and my return time must be afternoon.

ASSISTANT: Sorry, we do not find any flight with your requirements.

USER: Ok, not an issue. Anyways, thank you for the information.

ASSISTANT: Thank you for contacting us. Have a great day.