public Builder clearReason() {
            reason_ = getDefaultInstance().getReason();
            bitField0_ &= ~0x00000004;
            onChanged();
            return this;
        }
<code>optional string reason = 3;</code>

@return This builder for chaining.
turms-server-common/src/main/java/im/turms/server/common/access/client/dto/request/user/relationship/UpdateFriendRequestRequest.java