I recently switched to a new university and our professor asked us to make groups for a big project next semester. Since I was new I sent an e-mail to everybody available if they are free.
I got a response and answered with the topics I wished to pursue. I haven't heard from him since 4 days.
In the meantime somebody else contacted me with matching interests in topics.
What is a professional way to get an answer from the first student? Should I just set a deadline?
How can I handle the second student the best way?