PARIS (Reuters) - French Prime Minister Manuel Valls said on Monday proposals by Air France-KLM management to end a strike by pilots were reasonable. "The management has made proposals that seem reasonable to me," Valls said. "For France's image, for the image of the company and its future ... it is time that a solution is found. This strike must end as quickly as possible." (Reporting By Alexander Ratz; writing by John Irish; Editing by Andrew Callus)