Correct

劳驾 vs 请

/ láojià yus qǐng /
Strokes

Formula

1
劳您驾
2
劳驾您

Definition

劳驾 is a Verb-object phrase, 请 is a Verb, which means [please].

Example

劳驾 is a Verb-object phrase used in polite greetings, sometimes it has the same usage as 请.
劳驾 was originally used only in the Peking dialect, it has gradually been adopted by mandarin speakers.
1
Láojià
劳驾
  
(
qǐng
  
)
ràng
ràng
让路
  
!

Excuse me, please make way for me!

2
Láojià
劳驾
  
(
qǐng
  
)
gěi
bēi
fēi
咖啡
  

Excuse me, would you like to give me a cup of coffee?

劳驾 and 请, sometimes both can be used in a sentence.
In more formal polite expressions like 请您务必光临 (You are cordially invited to come), 劳驾 is not used. Syntactically, one usually says 劳您驾 or 劳驾您…….
劳您驾 劳驾您
3
Láo
nín
jià
  
,
qǐng
bāng
zhè
fēng
xìn
chū
出去
  

Would you like to post the letter for me?

4
Láojià
劳驾
nín
  
,
qǐng
bāng
zhè
fēng
xìn
chū
出去
  

Would you like to post the letter for me?

请 also means "to invite, to ask someone to do something"; while 劳驾 cannot be so used.
5
yào
qǐng
rén
zhuāngxiū
装修
fáng
房屋
  

He was going to ask someone to decorate the house.

6
bānjiā
搬家
hòu
yào
qǐng
tóngshì
同事
chīfàn
吃饭
  

After he moved, he would invite his colleagues to dinner.