You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, welcome to flight booking agency. How can I assist you today?

USER: I love spending my weekend time at Denver Zoo. Can you help me in booking a ticket to Denver?

ASSISTANT: Sure, can you please share your probable travel dates?

USER: I am comfortable to travel on dates 09/01 and 09/03. Please check with these dates.

ASSISTANT: Could you please provide the airport codes?

USER: My journey starts from PHX terminal to DEN.

ASSISTANT: Ok, please allow me a moment while I check for the availability of flight on this route.

USER: Sure.

ASSISTANT: May I know your name to proceed further?

USER: My name is Robert Hall.

ASSISTANT: Thank you for providing the details. Robert, there is a flight available with price fare 300 and the connection limit is 1 with AA airline. Would you like me to proceed with the booking?

USER: Please make sure the price is less than 200.

ASSISTANT: I am sorry to inform you that there is no flight available with the lowest price fare.

USER: That's fine, I will find other way out. Thank you for the information.

ASSISTANT: You are welcome. Thank you for contacting us.