what to reply when you dont know what to reply

When you ask a few questions, to a teacher or on a forum and they reply to the last one 'I do not know the answer to that question.' What are the ways to respond to that? I want

what to reply when you dont know what to reply

When you ask a few questions, to a teacher or on a forum and they reply to the last one  'I do not know the answer to that question.'  What are the ways to respond to that? I want to say it in a gentle way, with respect, and a thank you for all the information and answers to the previous questions they have already given me.

My tries:
"That's okay, thank you for your useful information"
"Oh, it's okay. Thank you so much for your useful information anyway"
"That's fine. Thank you so much anyway"
"Don't worry. Thank you so much anyway" <<I don't think this one is OK, anyway.

Or what else would you say?

Thank you  All of those work. I would probably use the first or second.  I would say Do you have any idea how I could find out? Or Is there any way I can find out?
You can preface this by saying Thank you.  Thank you Florentia.
Thank you e2efour, those are awesome ones

:thumbsup:

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