He looked toward Steve and spoke in a quiet, reassuring tone.

He spoke calmly, using the same reassuring tone as before.

It probably couldn't even interpret the reassuring tone of his voice.

"Not for very long," Grandfather said in a reassuring tone.

The voice was deep and soft, with a reassuring tone to it, but could offer little to go on now.

Picard continued in what he thought was a reassuring tone.

She took a deep breath, then continued with a reassuring tone.

"We will contain the plague," she said in her most reassuring tone.

Step 1: Approach the dog slowly, speaking in a reassuring tone of voice.

"Don't worry about it," Jack told her in a reassuring tone.