Mistaken Identity.
[Ace POV],
One reason I didn't want to see Sir Roland was because he could continue our previous conversation and inquire about our identity.
While I had considered one prior to the disappearance of the little girl, circumstances have changed now that I think I needed to create a better persona.
It's similar to when an investigator disguises himself as a delivery man to investigate a shop, but before arriving, he discovers that the shop has been robbed, and now the highly alerted boss of the shop has discovered him and requested him to reveal his identity.
At this point, if he does not provide a better identity, his cover might become almost non-existent or his plan may be foiled.