I want to find leads for group travelers to Thailand

I am looking for leads from anywhere in the world who specialize in group travel to Thailand. The information I am looking to gather from these leads includes contact information, group size, and any preferred travel dates. Having experience in the travel industry is preferable. I'm looking for leads that are reliable and dependable, and my goal is to form successful business relationships with them. If you think you can help me with finding quality leads, please let me know.