if so or if it so

[Sovan]

I have a question
is it common and correct to use if so or if it so ?

for example;
Does this room reservation is for Mr.A? if so / if it so, I think you have made wrong reservation.

 

[teechar]

[STRIKE]Does[/STRIKE] Is this room reservation [STRIKE]is[/STRIKE] for Mr. A?
If so, I think you have made the wrong reservation.

or

[STRIKE]Does[/STRIKE] Is this room reservation [STRIKE]is[/STRIKE] for Mr. A?
If it is, I think you have made the wrong reservation.

 

[Rover_KE]

[STRIKE]I have a question[/STRIKE] Unnecessary. Just go ahead and ask it.

Is it common and correct to use if so or if it so ?

Start every new sentence with a capital letter.