Quedar bien, “to come out well,” means to leave a good impression and keep things pleasant. Mexican Spanish has many phrases that serve it.
Sí, cómo no: “Yes, of course.”
Primero Dios: “God first,” meaning “God willing.”
Ahí lo vemos: “We will see about it.”
Ahí nos vemos: “See you there.”
Each can be a firm promise. Each can also be a kind way to leave a request open.