It's never ok to let a customer walk out unhappy, especially when they are right.
1-2	It's	_	_	_	_	_	_	_	_
1	It	it	PRON	PRP	Case=Nom|Gender=Neut|Number=Sing|Person=3|PronType=Prs	4	nsubj	4:nsubj|6:nsubj:xsubj	_
2	's	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	4	cop	4:cop	_
3	never	never	ADV	RB	_	4	advmod	4:advmod	_
4	ok	ok	ADJ	JJ	Degree=Pos	0	root	0:root	_
5	to	to	PART	TO	_	6	mark	6:mark	_
6	let	let	VERB	VB	VerbForm=Inf	4	xcomp	4:xcomp	_
7	a	a	DET	DT	Definite=Ind|PronType=Art	8	det	8:det	_
8	customer	customer	NOUN	NN	Number=Sing	6	obj	6:obj|9:nsubj:xsubj|11:nsubj:xsubj	_
9	walk	walk	VERB	VB	VerbForm=Inf	6	xcomp	6:xcomp	_
10	out	out	ADV	RB	_	9	advmod	9:advmod	_
11	unhappy	unhappy	ADJ	JJ	Degree=Pos	9	xcomp	9:xcomp	SpaceAfter=No
12	,	,	PUNCT	,	_	4	punct	4:punct	_
13	especially	especially	ADV	RB	_	17	advmod	17:advmod	_
14	when	when	ADV	WRB	PronType=Int	17	advmod	17:advmod	_
15	they	they	PRON	PRP	Case=Nom|Number=Plur|Person=3|PronType=Prs	17	nsubj	17:nsubj	_
16	are	be	AUX	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	17	cop	17:cop	_
17	right	right	ADJ	JJ	Degree=Pos	4	advcl	4:advcl:when	SpaceAfter=No
18	.	.	PUNCT	.	_	4	punct	4:punct	_
