The call flow of a user is modified based on the user's situation. A set of context-specific information regarding a user is collected, without prompting the user for this context-specific information within a call with the user. For instance, the context-specific information can include locational information regarding the user, weather information at the current location of the user, traffic information at the user's current location, proximity information of the user to a given transportation mode (airport, train station, and so on), as well as user preferences information. The situation of the user is determined based on the set of context-specific information collected, and the call flow of voice prompts to the user within the call is modified based on the situation determined.