Hello,.
user
Hello, how can I help you?
assistant
 I want to travel from Detroit to Philadelphia.
user
Sure, may I know airline codes and your journey details?
assistant
Yes, my travel day is from dec/22 to dec/24. My airport codes are  to PA-PHL from MI-DTW.
user
May I know your name?
assistant
I am Benjamin Brown.
user
OK, please wait a moment I will check and get back to you.
assistant
OK.
user
Sorry, there is no flights found on your details. Thank you.
assistant
OK, thank you for the information.
user
Have a nice day.
assistant