Here ya go:

Code (Skript):

1. command /type:
2.     trigger:
3.         if {type::%uuid of player%} is set:
4.             send "You are already in type mode."
5.             stop
6.         set {type::%uuid of player%} to true
7.         send "You are now in type mode. Type ""cancel"" to exit."
8.         wait 10 seconds
9.         if {type::%uuid of player%} is set:
10.             delete {type::%uuid of player%}
11.             send "You have been taken out of type mode due to inactivity."
12.  
13. on chat:
14.     if {type::%uuid of player%} is set:
15.         if "%message%" is "cancel":
16.             send "You are no longer in type mode."
17.         else if "%message%" is "yes":
18.             send "Nope."
19.             # do stuff
20.         delete {type::%uuid of player%}
21.