Formal:
* Gostaria de conhecê-lo(a). (I would like to meet you.) - This is the most formal option.
* Eu desejaria poder conhecê-lo(a). (I wish I could meet you.) - This is also formal and emphasizes the "wish" aspect.
Informal:
* Queria te conhecer. (I wanted to meet you.) - This is a more casual way to say it, suggesting a desire to meet but not necessarily a strong wish.
* Eu queria muito te conhecer. (I really wanted to meet you.) - This is still informal but expresses a stronger desire.
* Que pena que não posso te conhecer. (What a pity that I can't meet you.) - This conveys a sense of regret that you can't meet.
* Tomara que a gente se encontre um dia. (Hopefully we'll meet one day.) - This is more optimistic and expresses a hope to meet in the future.
Important:
* "lo(a)" is used for "you" in the formal version, while "te" is used in the informal version.
* Remember to use the correct gender for "you" (masculine "o" or feminine "a").
The best option for you depends on the context and your relationship with the person you are speaking to.