你我多年不遇承蒙班花大气
[nĭ wŏ duō nián bù yù chéng mĕng bān huā dà qì]
This means something like 'It has been many years since we met, thank goodness for your grand gesture or behavior'. A context-specific interpretation: perhaps referring to gratitude towards someone (like the prettiest girl or top student in class) who was kind and generous.