24. The system of claim 19 , wherein the operations further comprise: proactively providing a suggestion to the user after gathering user input under the respective candidate domain, wherein the suggestion offers to perform a task under another domain related to the respective candidate domain.
19. A system, comprising: one or more processors; and memory storing instructions, the instructions, when executed by the one or more processors, cause the one or more processors to perform operations comprising: receiving a user request through a conversation interface of the intelligent automated assistant, the user request comprising at least a speech input received from a user; identifying a respective candidate domain relevant to the user request from a plurality of predefined domains, wherein each predefined domain presents a respective area of service offered by the intelligent automated assistant, and wherein the respective candidate domain provides a reservation service to the user; making a reservation in accordance with at least the user request; and proactively offering an option to share information regarding the reservation with a selected group of one or more other users.