You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: Can you please help me with booking a flight ticket from OAK to JFK?

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

USER: My travelling dates are from Apr 02-04.

ASSISTANT: Do you have any preferences about flight connections?

USER: I would be comfortable with single stop over.

ASSISTANT: Do you have any preferences about class?

USER: No.

ASSISTANT: Please mention your name.

USER: Gregory Brown here.

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

USER: No problem, thank you for the information.

ASSISTANT: Welcome, have a great day.