A layoff (in British and American English) or retrenchment in (South African English) is the temporary suspension or permanent termination of employment of an employee or (more commonly) a group of employees (collective layoff) for business reasons, such as when certain positions are no longer necessary or when a business slow-down occurs.
A caller is a person who prompts dance figures in such dances as line dance, square dance, and contra dance. The caller might be one of the participating dancers, though in modern country dance this is rare. In round dance a person who performs this function is called a cuer. Their role is fundamentally the same as a caller, in that they tell dancers what to do in a given dance, though they differ on several smaller points. In northern New England contra dancing, the caller is also known as the prompter.
Betty should provide the information because the caller is an employee of the travel card vendor. Betty should provide the information because her SSN will be used to verify the validity of the card. Betty should not provide the information because she is unsure about the legitimacy of the call.