You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you at this moment?

USER: I am planning to visit Denver as my holiday trip, can you please help me in booking flight ticket from Oakland?

ASSISTANT: Sure, I will help you with that. Can you please mention your preferable travel dates?

USER: My preferable dates are July 27 and July 29 respectively.

ASSISTANT: May I know your preferable airport code names?

USER: My airport codes are OAK and DEN.

ASSISTANT: May I know your name for further process?

USER: Donna Allen here.

ASSISTANT: Is there any additional preferences do you have?

USER: No.

ASSISTANT: Ok, please wait a moment.

USER: Sure,I will wait for your response.

ASSISTANT: Frontier airline flight available with connection limit is 2 and fare is 100, shall I confirm this economy class flight?

USER: Yes, please proceed.

ASSISTANT: Your flight ticket is booked successfully, flight number is 1014.

USER: Thank you for your help.

ASSISTANT: You are welcome Donna Allen.