If there are.... then I would like
It is correct to write : "If there are tickets available, I would like to buy it one?"
And, in case is correct, what type of conditional would be?
Solution 1:
What you want to say is: "If there are tickets available, I would like to buy one."
Alternatively: "If there is a ticket available, I would like to buy it."
The pronoun must match the ticket in the earlier part of the sentence that it is referring to.