Punctuality

Yesterday in the office...

Mami's Boss : Tomorrow we have a meeting with at the customer's place. We will be discussing .... blah blah blah...

Mami's Colleague : OK.

Mami's Boss : So , we need to prepare this and that....blah blah blah....

Mami's Colleague : OK, no problem.

Mami's Boss : Let's go together, we will meet at the office first.

Mami's Colleague : Sure. What time?

Mami's Boss : We will meet at the office at 9.30am.

Mami's Colleague : OK. What time is the meeting?

Mami's Boss : 9.30am.

Mami's Colleague : *?????*