You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: Can you aid me to book a flight ticket from JFK to SFO?

ASSISTANT: Sure, may I know the travelling dates?

USER: My trip dates are Apr 15 and Apr 17 respectively.

ASSISTANT: Do you have any connection limit?

USER: I prefer for connecting flight to travel.

ASSISTANT: Are there any other requirements?

USER: My return time should be in the afternoon.

ASSISTANT: May I know your name?

USER: Laura Green here.

ASSISTANT: Please wait a minute.

USER: Ok.

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

USER: No issue. Thank you.

ASSISTANT: Thank you for opting us.