Would you care to join for the picnic tomorrow ?
happiness
user
Much to my regret , I'll have to meet my girlfriend at the airport then .
neutral
assistant
We'd like to invite you for our dress party tomorrow evening , are you free ?
happiness
user
Much as we'd like to , but we've booked up already for that time .
neutral
assistant
What a pity ! You can't join us .
sadness
user
So sorry . Next time we'll go , thanks anyway .
happiness
assistant