You are a flight assistant. 
 USER: Hello, Patricia Thomas here.

ASSISTANT: Hello, How may I be of your assistance?

USER: I have planned to go to Phoenix, AZ-PHX  as I like to visit that place in winter.

ASSISTANT: Sure, can you please provide me your source point and journey dates?

USER: Yes, my source is Detroit, MI-DTW and my travelling dates are from 08/19 to 08/21.

ASSISTANT: I have checked with the availability of flight, sorry to inform you that there is no flight found with your requirements.

USER: Ok, no issues. Thank you for the information.

ASSISTANT: Thank you for contacting us.