Your requirements are very vague.

• You didn't specify which components are constant and which are not. I assumed "\" and "date : " are constant.
• You didn't specify of which chars the variable parts could be made. I assumed what is represented by "GeorgeO" could contain spaces (which required specifying " at the parker inn"),
• You didn't specufy from where the lines came. I assumed a file handle.
• You didn't specify what to do with the extracted values. I print them.

while (<$fh>) {
   print("$1\n") if /\\(.*?) at the parker inn$/
                 or /^date : (\S+)/;
}
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