You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Jonathan Nelson. I am looking for direct flight from OAK to meet my sister, can you please help me to book a flight to OAK?

ASSISTANT: Sure, can I know your travelling dates?

USER: Sure, my preferable travel dates are 25 Sept and 29 Sept.

ASSISTANT: Please check with your travelling dates.

USER: Sorry, my return date is Sept 27.

ASSISTANT: We found a direct flight from Delta airline and the fare is 100 with an economy class.Shall I proceed?

USER: Ok, please proceed for booking.

ASSISTANT: Your ticket is booked with 1029 flight number.

USER: Thank you for your help.

ASSISTANT: Thank you for reaching us.