This is a simple acid-base rection
H2O + CO2 + NaOH --> NaHCO3 + H2O
CO2 is an acid anydrite and NaOH is a base. So reaction gives the salt Na2CO3 and water
Another posible product is the salt Na2CO3 that is prodused if a 1:2 ratio of CO2 and NaOH is used