You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: Could you please book  a flight ticket from SFO to OAK?

ASSISTANT: Sure, may I know the travelling dates?

USER: My trip dates are July 16 and July 18.

ASSISTANT: Do you have any connection limit?

USER: I need a single connecting flight.

ASSISTANT: Is there any other requirements?

USER: No.

ASSISTANT: May I know your name?

USER: I am George Lopez.

ASSISTANT: Sorry, no flights found with your chosen dates.

USER: No problem, thank you.

ASSISTANT: Thank you for opting us.