套磁后教授说可以帮忙联系朋友看能不能有暑研的opening，但之后就没有回复了该咋办

给教授发了第一封套磁的邮件，他拒绝了，但是在文末加上了可以帮忙联系他的朋友看有没有暑研的opening，（他的回复：Thank you very much for your interests on XXX! Unfortunately I cannot host you this summer as XXX has very limited space for hosting visiting student per group. If you like I can connect you with my friends in the XXX area and see if they have openings.）然后下面我给这样回了:Dear XXX, Firstly, thank you very much for your kind and instant reply! It's my great pleasure to have your help to contact other professors in the XXX area for possible openings! And shall I write another  email for this?之后就没有回信了......需要发第二份问一下吗?要写的话邮件内容写点什么好，求指点

如果一直没回复的话 再发一封问问联系的情况如何吧 大概就是说please let me know if there is any openings. I will contact the professor ASAP with my CV blahblahblah

一般就是cc你的邮件给其他professor 如果其他professor 不回复 这个教授也没法催…

那多半是没找到可以提供opening的教授了，我再发一份问问好了，谢过楼上两位