If you go on a business trip alone, then you don't need to talk much, and you can eat whenever you want. But if you go with a group, they might want to eat together. Some people like to eat together all the time, but some people might not want to eat because they are not hungry.

"What kind of food do you guys want to eat today?"
"Anybody want to go for lunch?"
"I'm going to lunch. Anybody want to join me?"

"Let's go in 20 minutes. I have to finish this real quick."
"I can't make it. I have to finish this and it will take me another 30 minutes."
"I'm going to pass today. I brought a bagel with me."
"I have a small sandwich. I'm just going to eat here."

"Where should we have dinner tonight?"

"Hey, let's go to the Italian restaurant next to the hotel."
"We can either go to the steak house in the hotel, or the Italian restaurant next door."