Nursing Care Plan Help

I need help writing goals and interventions for a patient that didn't experience any major issues throughout the shift.

They were admitted for COPD exacerbation and were most likely going to be discharged the next day. Only thing I can think of was when I was ambulating with them I was concerned about their respirations, O2 sat and if they were feeling weak. We had a wheelchair follow behind, they used the walker and they were on 2L O2. Took respirations and O2 sats before, during and after ambulating. They had some dyspnea and O2 dropped from 98 to 89 after 200 ft, we rested in the hallway and checked O2 again and it was up to 93, we continued back to room. After sitting and resting for about 5 min, respirations became less labored and O2 went up to 95.

My question is, would Impaired gas exchange be the appropriate NDX? What would be some goals to include in this particular case?

I'm having such a hard time writing these careplans. My instructor says I'm all over the place and basically try to squeeze 8 different careplans into one. Any help would be appreciated!