You can do this really easily from your box office, first head to your box office, find the booking you’d like to change and click 'Edit'
You'll be shown a popup window with all the information about the booking. Alongside changing the performance, you can also make refunds and change the name of the booking here
To change the performance, just click 'change date' and you'll be shown a dropdown of all the perfomances in the future
When you've chosen the date, just click 'Save' and if there is sufficient capacity the booking will be moved to the new performance. If there isn't sufficient capacity you'll be shown a notification saying so
The customer will not automatically recieve an email with their updated tickets, to do so, just click 'Download printable ticket' and you can send it to them