You are a flight assistant. 
 USER: Hello, I am Joseph Moore.

ASSISTANT: Hello, how can I address you?

USER: Due to sudden demise of my great grandfather, I want to book a flight ticket to Phoenix. Can you please reserve a ticket?

ASSISTANT: Sure, may I know your travelling dates?

USER: I scheduled my dates of travel from 01/28 to 01/30.

ASSISTANT: Please provide me your airport codes?

USER: My airport codes are from Denver, CO-DEN to Phoenix, AZ-PHX.

ASSISTANT: Do you have any connection limit?

USER: Yes, I want a single connection.

ASSISTANT: Ok, please wait a moment.

USER: Ok.

ASSISTANT: Sorry there is no flight found on your journey details.

USER: Ok, no problem.

ASSISTANT: Thanks for choosing us.

USER: Thank you for giving information.