You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you at this moment?

USER: Please book me a ticket from JFK to ORD to meet my family.

ASSISTANT: Sure, I will help you with that. Can I have your travel dates please?

USER: I would like to travel on May 07th and return on May 09th.

ASSISTANT: Ok, please let me know the timings of your journey.

USER: I am ok with any time.

ASSISTANT: Do you have any other specifications to get best flight for you?

USER: I like business class.

ASSISTANT: Ok, please let me know your good name to proceed further.

USER: Myself Mark Johnson.

ASSISTANT: Sorry to inform you that no flight is available to you on your dates.

USER: Ok, no problem. Any way thank you.

ASSISTANT: Thank you for choosing us, have a good day.