A Loud Phone Call on the Bus

You are travelling home on a crowded bus in Frostmere, Yukon. The passenger beside you is having a loud speakerphone conversation, and both sides of the call are clearly audible. You have another twenty minutes to travel, and there is no space to move away. The passenger is discussing arrangements for a family visit and may not realize how loud the call is. You want to ask for less noise without embarrassing the passenger or starting an argument.