Examples:

• When you're in town, give me a holler, and we can grab lunch together.
• If you need any help with your project, just give me a holler, and I'll be there.
• I haven't seen my cousin in a while. I should give her a holler and catch up.
• Before you leave the party, give the host a holler to thank them for the invitation.
• If you come across any interesting job opportunities, give me a holler. I'm looking for a new job.
• Let's plan a trip together. Give me a holler when you're free, and we can start making arrangements.
• I heard you're an expert in web design. I might need some help with my website, so I'll give you a holler.
• Don't hesitate to give me a holler if you need a ride to the airport. I'll be happy to help.
• We should meet up for coffee sometime. Give me a holler when you have a free afternoon.
• Whenever you're in the neighborhood, give us a holler. We'd love to have you over for dinner.