You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am planning to go to Denver Zoo, so please help me to book a flight ticket.

ASSISTANT: Sure. Please provide me your travel details.

USER: My travel dates are 05/26 and 05/28. I want a flight with connection 0 and price limit is 200.

ASSISTANT: May I know your airport codes?

USER: The source airport is PHX and the destination airport is DEN.

ASSISTANT: Can I know your name?

USER: My name is Samantha Martin.

ASSISTANT: There is no flight with 0 connection, Samantha.

USER: It's ok, thank you for the information.

ASSISTANT: Thank you for choosing us.