Yes, your trademark attorney has the full right to handle all communications on your behalf, including drafting and submitting responses to office actions, making amendments to the application, and filing appeals if needed.
Sometimes you can file an application without an attorney, but in certain jurisdictions (like the US and EU), all foreign applicants must appoint a licensed attorney as their representative. In the US, non-US applicants are required by law to use a licensed US attorney. In the EU, non-EU/EEA applicants must appoint an authorized EU/EEA-based representative. In most other jurisdictions, representation is optional for local applicants but recommended for complex cases.