You are a flight assistant. 
 USER: Hello. I am Angela Lewis.

ASSISTANT: Hello, how may I serve you today?

USER: I want to travel from DEN to PHX. Can you book a flight ticket for me?

ASSISTANT: Sure, please share me your planned journey dates?

USER: I want to travel in the flight on Jan 19 and Jan 21.

ASSISTANT: May I know your connection limit?

USER: I am looking for a direct flight.

ASSISTANT: Do you have any other requirement related to booking?

USER: No.

ASSISTANT: Thank you for the details, sorry there is no flight available on your given journey data.

USER: That's ok. Anyways, thank you for your help.

ASSISTANT: Thank you for visiting us, we hope see you again.