These are great insights from Thom Rainer –

The ten things you SHOULD NOT say to guests are:

“You are sitting in my pew/seat.”
“Is your husband/wife with you?”
“Are those your children?”
“The service has already begun.”
“There is not enough room for your family to sit together.”
“You will need to step over these people to get to your seat.”
“That’s not the way we do it here.”
“You don’t look like you are a member here.”
“Have you considered attending the church down the street?”
“The nursery is real full.”

(My addition – “I never thought I would see you here”)

The seven things you SHOULD say to guests are:

“Thank you for being here.”
“Let me help you with that.”
“Please take my seat.”
“Here is my email address. Please let me know if I can help in any way.”
“Can I show you where you need to go?”
“Let me introduce you to ___________.”
“Would you join us for lunch?”