Dear {friend, acquaintance, family member, etc.},
I’m really looking forward to seeing you at {event}! It’s going to be a blast.
Thank you so much for sending along the {amount} for {gift/party/etc.}. I am so sorry to let you know that after consulting with the {venue/caterer/transport company/guest of honor/etc.}, I’ve realized that we underestimated the cost.
Please send along an additional {amount} via {payment method} as soon as you’re able. This will ensure that we can cover {specific expenses} and make this event the best that it can be for {guest(s) of honor}.
Don’t hesitate to let me know if this additional expense creates a burden for you. I’m sure we could come to some kind of arrangement.
Sincerely,
{Name}
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Index of letter of apology templates