You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Anna Young.

ASSISTANT: How may I help you out?

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

ASSISTANT: Sure, I will help you in booking the ticket. May I know your travelling dates please?

USER: I am departing on Apr 17 and return on Apr 19.

ASSISTANT: Do you need any specifications?

USER: I need a flight with connection limit 0.

ASSISTANT: Do you have any other preferences?

USER: I want to depart in evening.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: Sorry, there are no flights.

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