You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you today?

USER: I need to book a flight ticket from DEN to PHX, Can you please help me for booking?

ASSISTANT: Sure, can you please mention with your dates of journey?

USER: I would like to travel on 04/13 to return on 04/15.

ASSISTANT: May I know your good name please? Do you have any other requirements?

USER: Benjamin Perez. I need a direct flight.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry Perez, there is no flight found as per your travelling details.

USER: Ok, no problem.\. Thanks for your information.

ASSISTANT: You are welcome.