Hi. Well I do not know if there is a spell for it,but here is a funnier yet more difficult alternative. Learn to do astral projection. Project yourself to where that person is sleeping.Once there just know you can connect to their mind somehow,it is up to you how you do it.
If they are deep-sleepers and don't usually remember their dreams,it is unlikely for your experience that you desired,and yet you will have accomplished AP,which is a great ability.
If they usually remember dreams,both of you may have some fun about it.
I don't really know if this will work or how easy it would be for you to astrally project but trying won't hurt I suppose. ^.^
No such spell,as dreams are an expression of the subconscious mind.However you can use some tricks when interacting with a person to affect the subconscious mind to think of you.
First,try to imitate (not too much) the persons manner of speech,hand movement,body stance,keep eye contact,etc.
Know when to engage in a conversation,based on observations on that person's mood.However this may or may not make that person dream of you.It will just make that person fonder of you.