You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am Robert Hernandez.

ASSISTANT: Ok.

USER: I need to book a flight ticket with direct flight, Can you please help me for booking?

ASSISTANT: Sure, I am here to help you. Can I know when you want to travel?

USER: I would like to travel on 06/25 to 06/27.

ASSISTANT: Ok, please help me with your airport codes.

USER: My source point is OAK to JFK.

ASSISTANT: Wait a minute please.

USER: Sure.

ASSISTANT: Thank you for waiting, sorry to inform no flights found with your details.

USER: Ok, no problem.

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

USER: Thanks for your information.