I would place a comma before and after "Sandi". The last word in the first sentence should be plural "meetings".
The second lines under the meeting arrangements should end with periods/full stops. There should be a space before the second use of "Lobby".
I would make two sentences from the last sentence: You have my credit card on file to authorize the charge. Thank you again for coordinating the bus services. (notice the period/full stop)
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