User: I think that is what I need but I would like to put the order in later just in case the meeting has us late
Assistant: Ok what time would you like me to wait until?
User: Go ahead and make the order by 4PM unless you hear differently from me.
Assistant: Ok I will order the 4 tickets at the Watertown IMAX movieplex for 6 PM, at 4 PM unless I hear from you that the plan has changed