"Pam,
    I just wanted to thank you for all of your help with our firm dinner last week.  Everything looked lovely and we could not have been more pleased.  I hope we are able to work together again soon.
                                                                                                                                                    -Mary Ellen"

"Pam, 
    Thanks for all of your hard work and that of your team.  If any glitch happened, I didn't know about it.  
                                                                                                                                                     Fondly,
                                                                                                                                                     Linda"