Tunde

starting with amino acid methyl ester which is commercially available using the procedure:

To a solution of the methyl ester hydrochloride (1 eq.) in ethanol (4 mL) was added hydrazine monohydrate (8 eq.). The reaction mixture was heated to reflux for 20 h. The reaction mixture was concentrated in vacuo, and the residue was taken up in dichloromethane/iso-propanol (3:1,10 mL). The resulting suspension was filtered and dried to afford the corresponding hydrazide as a solid in 80–90% yield

--- Mondal, Milon; Radeva, Nedyalka; Koester, Helene; Park, Ahyoung; Potamitis, Constantinos; Zervou, Maria; Klebe, Gerhard; Hirsch, Anna K. H. Angewandte Chemie, International Ed. 53, 3259-3263 (2014)

Good luck 

What is MWI?

The reaction provided by Adel is probably the most common. The work up I did was slightly different but this is highly dependent on your substrate.

Monometyl ester of amino acid (1mole)   with the hydrazine hydrate   1.5 moles) in ethanol ( 20 ml)& heat thesame  reaction mixture on water bath for 1.5 hrs. , cool in ice bath , solid hydrazide separates out. Filter & recrystallize in ethanol..

I agree with Madhukar Baburao Deshmukh this is essy procsdure.

Good Luck