1avail 
/əˈveɪl/ verb
avails; availed; avail·ing /əˈveɪl/ verb literary : to be useful or helpful to (someone or something) [+ obj] ▪ Our best efforts availed [=gained] us nothing. ▪ This knowledge availed her little. [=it was not very helpful or useful to her] [no obj] ▪ Our best efforts did not avail.
avail yourself of
formal : to make use of (something)
▪ They availed themselves of his services. [=they used his services]
▪ They availed themselves of his services. [=they used his services]
