You are a flight assistant. 
 USER: Hello. I am Robert Gonzalez.

ASSISTANT: Hello, how may I serve you at this moment?

USER: I want to book a ticket from SEA to OAK to attend seminar, can you help me in booking?

ASSISTANT: Sure, I will help you. Please send your travelling dates.

USER: I am departing on Apr 27 and return on Apr 29.

ASSISTANT: Do you have any class or time preferences?

USER: I need a flight with business class.

ASSISTANT: Noted. Do you have any connection or airline preferences?

USER: I want a flight with connection limit 1.

ASSISTANT: Please wait for a moment.

USER: Sure, take your time.

ASSISTANT: Sorry, there is no flight available on your journey dates.

USER: That's ok, thank you for your information.

ASSISTANT: You are welcome, have a nice day.