You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello,.

USER: I am Carolyn Campbell.

ASSISTANT: How can I support you?

USER: I want to attend a meeting at PA-PHL from MI-DTW. Can you book  a direct flight?

ASSISTANT: Sure, on which dates you prefer you travel?

USER: My travel dates are 11/15 and 11/17.

ASSISTANT: Ok, hold on for a moment.

USER:  Ok.

ASSISTANT: Sorry, no flights found as per your request.

USER: Ok, no issues.

ASSISTANT: Thanks for opting us.

USER:  Thank  you for your help.