You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I am Sharon Nelson. Can you help me in booking my flight ticket from OAK to EWR?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Can you share me your trip dates?

USER: My trip dates will be Dec 20 to Dec 22.

ASSISTANT: Do you need any break in your journey?

USER: Yes, I prefer a break with in my journey.

ASSISTANT: May I know your depart time and arrival time?

USER: Please check the flight that should return in the morning.

ASSISTANT: Do you have any other preferences?

USER: No, please go ahead with checking by the given details.

ASSISTANT: Sorry to inform you that, there are no flights available with your requirements.

USER: That's ok, thank you.

ASSISTANT: Thank you for opting us.