You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I need your help to book a flight from SFO to OAK.

ASSISTANT: Sure, can you share me your trip dates?

USER: I want to depart on Sept 16 and intend to return on Sept 18.

ASSISTANT: Do you have any connection limit?

USER: Yes, I need a flight with single connection.

ASSISTANT: Is there any other specifications?

USER: I prefer an normal-cost airline to travel.

ASSISTANT: May I know your good name?

USER: Myself Brain Nelson.

ASSISTANT: Sorry, no flights are available in this route as per your requested dates.

USER: Ok, not an issue. Thank you for the information.

ASSISTANT: Thank you for reaching us.