Hi [guest first name],
I hope that you've settled in all right and that you're experiencing a 5-star stay :)
Please let me know if there's anything you need or if I can assist you in any way.
All the best and enjoy your stay!
[Your Name]
******If the guest has had issues you know they are not experiencing a 5-star stay do DO NOT send the above instead send the below
Hi [guest first name],
I understand you had [XYZ issue] upon checking in. We apologise for this and are working to resolve the issue.
Besides [XYZ issue] is there anything you need or if I can assist you in any way?
All the best and enjoy your stay!
[Your Name]