You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

USER: I am looking for a flight from LGA to OAK, can you help me out?

ASSISTANT: May I know on which dates you are willing to travel?

USER: My trip dates are from Nov 30 till Dec 2nd.

ASSISTANT: Do you require any stopovers in your journey?

USER: I am looking for a direct flight.

ASSISTANT: Do you have any other requirements?

USER: I prefer to travel in economy class flight.

ASSISTANT: Sorry to inform you that unfortunately there is no flights available by the given details.

USER: That's ok, not an issue. Thank you for your information.

ASSISTANT: May I know your name?

USER: Myself Donna Phillips.

ASSISTANT: Thank you.

USER: Welcome.