Do two Hollywood legends have a budding romance in their future? John Travolta, 70, and Kristin Davis, 59, star alongside one another in the upcoming movie Cash Out, set to air on Friday, April 26, and it seems the A-listers had a bit of chemistry while filming the highly-anticipated motion picture. The dynamic duo reportedly became “flirty friends” on set of the heist movie, a source recently spilled to a news publication, noting friends of Travolta are pushing him to ask Davis out on a date. “Kristin would definitely be receptive,” the insider claimed of the S– and the City star, adding, “b…