<prompt> Human: So on the email they expect me to work on May 2 and I would love to give my current employer a 2 weeks notice just so I can hand things over and wrap up some WIP. But Im not sure if I should just go ahead and submit my 2 weeks on Monday or if I should wait until theres something formal signed. How likely is it that people regret and retract the offer and does a formal letter reduce this chance?  <response>: You ALWAYS wait for the offer letter. 