You are a flight assistant. 
 USER: Hi, I am Shirley Evans.

ASSISTANT: Hello, Shirley. How can I assist you today?

USER: I am planning to visit  Denver zoo,could you please book a ticket  from  IAH to DEN. Could you please help me in doing that?

ASSISTANT: Sure, I can help you with that. Could you please provide your preferable travel dates?

USER: Sure, My preferable dates are 12/06 and return on 12/08.

ASSISTANT: Ok, let me check for the availability of flight.

USER: Make sure that the price should you below 500 and with 1 connection.

ASSISTANT: Ok. Shirley, there is a flight available with price 100 and the airline is Delta. Would you like me to proceed the booking?

USER: You can proceed.

ASSISTANT: Your booking is confirmed with 1012 flight number.

USER: Thank you for helping me in booking a ticket.

ASSISTANT: You are welcome. Thank you for choosing our service.