You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I am planning to book a ticket from JFK to OAK. Can you please help me out?

ASSISTANT: Sure, will you mention your travelling dates please?

USER: I am planning to travel on June 12 and return back on June 14.

ASSISTANT: Do you have any preferences about flight connections?

USER: My return time is evening. I am looking for a connecting flight.

ASSISTANT: Please mention your name.

USER: My name is Debra Lopez.

ASSISTANT: There is no flights found under your preferable details.

USER: Thank you for your service.