You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you out today?

USER: I am Patrick Nelson. I am planning to visit Oakland OAK to meet grand father from New York JFK. Can you find a flight ticket for me?

ASSISTANT: Sure, I will help you in booking the ticket. May I know your travelling dates please?

USER: Thank you. My planned journey dates are on June 21 and return on June 23.

ASSISTANT: Can I know that you have any preferences?

USER: No, but I want to depart in the evening time and return in the afternoon time.

ASSISTANT: Do you require any specifications?

USER: Yes, I need a single connecting flight.

ASSISTANT: Sorry, there are no flights found in our database as per your requirements.

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

ASSISTANT: Thank you for reaching us.