This is not currently supported, though it has been requested before. If it is important to you, you can vote for the issue here:
Incidentally, if you put the user's @-mention name as part of the search (e.g. "@SteveSweales some search terms") it will limit the results to either 1) messages that actually contain the string "@SteveSweales" or messages from that user. It's not the perfect solution, but does provide a measure of flexibility that might help you out for now.
Earlier this year we made the difficult decision to discontinue our team messaging tools, Stride and Hipchat. The end of life date for Stride and Hipchat Cloud is quickly approaching - February 15, 2...
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