You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Carolyn Mitchell.

ASSISTANT: How can I assist you today?

USER: Can you please help me in booking a flight ticket from ATL to OAK?

ASSISTANT: Sure, I can help you with that. May I know your planned departure and return travel dates please?

USER: I would like to fly on Apr 23 and return on Apr 25.

ASSISTANT: Ok, may I know your class preference please?

USER: I am comfortable with any class.

ASSISTANT: May I know your airlines preference please?

USER: I am comfortable with any airline.

ASSISTANT: Please let me know if you have any other specifications.

USER: Make sure that, my depart time is morning.

ASSISTANT: Ok, please wait for a while.

USER: Ok, I need a direct flight.

ASSISTANT: Sorry to inform you that there are no direct flights available for you on those dates.

USER: Not an issue. Thank you for your information.

ASSISTANT: Thank you for choosing us, have a great day.