You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I aid you?

USER: I need to book a flight ticket from DTW to OAK, Can you please help me for booking?

ASSISTANT: May I know on which dates you are willing to travel?

USER: I would like to travel on 10/04 to return on 10/06.

ASSISTANT: Do you have any other requirements to be met?

USER: I need a business class.

ASSISTANT: Can I have your name please?

USER: Alexander Taylor here.

ASSISTANT: Sorry to inform you that unfortunately there is no flights available by the given details.

USER: Ok, no problem.

ASSISTANT: Thank you.

USER: Thanks for your information.