Hello. I am Stephen Johnson.
user
Hello, do you need any help from us?
assistant
I planned to meet my cousin in PHL, can you please help me to book a flight ticket from DEN?
user
Sure, can you please tell me your departure and arrival day?
assistant
I prefer to travel on 09/13 and 09/15.
user
Sorry, there is no flight on your requested travelling dates.
assistant
Ok, no problem. Thank you for your service.
user
Thank you for opting us, have  a great day.
assistant