You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, do you need any help from us?

USER: I am Dennis Wright. I planned to attend for a wedding in PHL, can you please help me to book a flight ticket from DEN?

ASSISTANT: Sure, may I know your trip dates?

USER: I prefer to travel on 03/02 and 03/04.

ASSISTANT: Sorry, there is no flight on your requested travelling dates.

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

ASSISTANT: Thank you for opting us, have a great day.