The context of the following conversation is Austin wanted to do a favour for Kendall so he decorated Kendall's house for the party.:
Kendall says Austin decorated my house for the party.  He did me a big favour..
The friend responds How nice of him..
Kendall responds I was just too busy working late every night so he offered to help me..
The friend responds What was the party for?.
Kendall responds It's my roommate's birthday and I wanted to throw her a party and invite her friends..
The friend responds Birthday parties are the best of times..