Unable to retrieve trip details for Joe Lukeman with confirmation number SFTBAO from United Airlines.

**Issue**: After multiple attempts (5+ submissions), United Airlines' system consistently returns validation error: 'Your confirmation number, a 6 character alphanumeric code, and/or last name is not valid.'

**What was tried**:
- Navigated to United Airlines Find Your Trip page
- Entered confirmation number: SFTBAO
- Entered last name: Lukeman
- Submitted form multiple times
- Waited for page loads between attempts

**Possible reasons**:
1. Confirmation number may be incorrect or has typos
2. Last name may be spelled differently in reservation
3. Trip may have been booked through a third-party site (not directly with United)
4. Trip may have been cancelled or doesn't exist in current system

**Recommendation**: Verify the confirmation number spelling and check if booking was made directly through United or via a travel agent/third-party website.