Serginov
Onkonkoronkonk
Okay, So I need help with a quest NPC... 
Player does what the NPC told him..
And so on..
So you can say mission multi times and he say different if you repaired his things..
Player: Hi
NPC: hello
Player: mission
NPC: i have a mission for you, repair my chair
The player does what the NPC have told him.
Player: Hi
NPC: hello
Player: mission
NPC: So you repaired my chair?
Player: yes
Player gets reward.
Player: Hi
NPC: hello
Player: mission
NPC: Yea, I have another mission for you, repair my table!
Player does what the NPC told him..
And so on..
So you can say mission multi times and he say different if you repaired his things..