The issue appears to be with the action switch:
{
"parameters": {
"propertyName": "action",
"rules": [
{
"value": "booking",
"output": 1
},
{
"value": "cancel",
"output": 2
},
{
"value": "reschedule",
"output": 3
},
{
"value": "check availability",
"output": 4
}
],
"options": []
},
"id": "Action-Switch",
"name": "Action Switch",
"type": "n8n-nodes-base.switch",
"position": [
400,
0
],
"typeVersion": 1
},
this is an old version of the node (v1 vs current v3.2).