Things come up. Moving your session is no trouble at all, and you can do it as many times as you need.
Tell me what suits and I will move it across. Your deposit carries over to the new time, so there is nothing more to pay now.
No hard feelings, and no explanation needed. Let me know and I will take care of it. Nothing beyond the $150 deposit is ever charged for a session that did not happen, and the deposit is not refundable. If you would rather move it than cancel it, just say the word.
If a refund is ever owed to you it goes back to the card you paid with, and usually lands within a few business days depending on your bank. If you are not sure which time you booked, it is on the calendar invite and the confirmation that went to your email and phone.