[Shikijin]

In that situation saying reassuring things was what a con man is supposed to do.

In fact:

Spoiler for Kaiki:

1) Kaiki is a vagrant, so he is not fixated on a particular city. And as a con man you have to know when to escape.
2) Kaiki will reappear again in Tsukihi Phoenix. He had a free coupon for Mr. Donut and he wanted to use it. This shows how words are not necessarily binding for him.