You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: I want to attend a seminar in San Francisco, can you book a ticket from OAK to SFO?

ASSISTANT: Sure, I can help you with that. Can you please help me with your traveling dates?

USER: My trip dates are 04/14 and 04/16.

ASSISTANT: Ok, let me check for the availability of flight.

USER: I need a flight with connection limit as 0.

ASSISTANT: May I know your name to proceed further?

USER: My name is Robert Perez.

ASSISTANT: Robert, I am sorry to inform you that there is no flight available at your request.

USER: It's fine. Thank you for searching.

ASSISTANT: Thank you for contacting us.

USER: Welcome.

ASSISTANT: Have a great day.