```python
from pyscf import gto, scf, df, agf2, lib
import numpy as np

# Define the molecule
mol = gto.Mole()
mol.atom = '''
    H 0 0 0
    H 0 0 0.74
'''
mol.basis = 'cc-pVDZ'
mol.build()

# Define the auxiliary basis for density fitting
auxbasis = 'cc-pVDZ-ri'

# Run RHF calculation with specified convergence tolerance
mf = scf.RHF(mol)
mf.conv_tol = 1e-9
mf = df.density_fit(mf, auxbasis=auxbasis)
mf.kernel()

# Run AGF2 calculation with specified convergence tolerance
gf2 = agf2.AGF2(mf)
gf2.conv_tol = 1e-7
gf2.kernel()

# Print the first three ionization potentials and electron affinities
print("Ionization potentials:", gf2.ip[0][:3])
print("Electron affinities:", gf2.ea[0][:3])

# Calculate the MO-basis density matrix
dm_mo = mf.make_rdm1()

# Calculate dipole moments
dip_ints = mol.intor_symmetric('int1e_r', comp=3)  # Get dipole integrals in AO basis
dip_mom_ao = np.einsum('xij,ji->x', dip_ints, dm_mo)  # Transform to MO basis and contract with density matrix
dip_mom = dip_mom_ao + mol.atom_charges() @ mol.atom_coords()  # Add nuclear component

# Print the calculated dipole moment
print("Dipole moment (Debye):", dip_mom * lib.param.BOHR)
```