NPC bug - common

Well, the thing is... I will make it real easy for you to understand what the problem is. Look below:

Player1 - Hi
NPC - Hi
Player1 - Thais
Npc - Do you want to travel to Thais?
Player2 - Yes (He does not see the NPC writing the text above yet Player2 is the one that gets teleported).
Npc - Have a nice travel.
Player1 - Starts Over~

Does anyone know how to solve this problem?

Thanks in advance,
Krille