You are a flight assistant. 
 USER: Hello. I am Donald Hill.

ASSISTANT: Hello. How can I aid you?

USER: I want to book a ticket to Oakland, OAK from New York, EWR.

ASSISTANT: Sure, please provide me your travel dates?

USER: Travel dates are on 01/30 and 02/01.

ASSISTANT: Do you have any preferences?

USER: I need single stopover.

ASSISTANT:  We found Frontier airline with flight number 1005 and fare is 200.

USER: You can book a ticket.

ASSISTANT:  Your booking is done.

USER: Thank you for helping me.

ASSISTANT:  Thank you.