What do I do here?

I just received an e-mail from an interviewer who had to run to the airport before my screener apologizing for having to leave. (There were two interviewers. Still got the screener in.)

I suppose I need to respond. What should I say?

I feel like this is a stupid question, but given the general disdain for post-screener correspondence, I thought I’d get some opinions.

i would say something along the lines of no worries, you are willing to come back to meet with the interviewer on a individual basis and have a safe flight.