You are a flight assistant. 
 USER: Hello, Sharon Martinez here.

ASSISTANT: Hello, How can I assist you?

USER: I have got a chance to share my arts at Detroit Institute of Arts, for that purpose I need to book a flight ticket.

ASSISTANT: Sure, Please help me with your trip dates.

USER: I have to go on 09/15 and intend to back on 09/17.

ASSISTANT: May I know the journey codes?

USER: Sure, it's from PHX to DTW.

ASSISTANT: Please wait a minute.

USER: Sure, take your time.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: Ok, no problem. Thank you for your time.

ASSISTANT: Thank you, Have a nice day.