You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Barbara Moore here. Can you please help me in booking a flight ticket from OAK to JFK?

ASSISTANT: Sure, I will help you to book a flight ticket. Can you please share me your travelling dates?

USER: Sure, my travel dates are from Sept 16 to Sept 18.

ASSISTANT: Do you have any connection limit?

USER: I need a connecting flight.

ASSISTANT: Ok, may I know your departure time and arrival time?

USER: I would like to depart in the evening.

ASSISTANT: Sorry, no flights are available on your route.

USER: Ok, no problem. Thank you for the information.

ASSISTANT: Welcome, have a nice day. Thank you for choosing us.