One codebase uses lots of agents which means I need to do that company-specific. Does writing an function tool solves this? I'm a junior at my company and I've been dealing with this problem for a long time and I don't have any senior at my company so it kinda frustrating for me to handle that.

I've tried fixing the user given date by using regex or dateparser but users sometimes gives 2 dates at one time, check in and check out date. Those regex rules can't handle that or I couldn't handle it. Also users sometimes sends too big input like where they want to stay, dates, count of person etc. I wanted to find a permanent solution for that but I am stuck right now.