If you live in the United States, don't talk to cops. You don't know this person. You don't know that the cop isn't a criminal and is now looking for a patsy. Don't discuss your day, don't discuss your travel plans, don't say where you've been. If a cop asks to search anything, don't say yes, don't say no, don't say sure, no thanks. The only thing you say is 'I do not consent to a search', regardless of how it is asked. If a cop asks you anything, say 'I invoke the fifth and I want to speak to a lawyer'. Burghuis v thompkins effect hobbled you miranda rights. And you must verbalize your right to remain silent. You must also verbally request a lawyer in basically eight grade english. No slang. If you say 'I want a lawyer, dawg' state v demesme makes it reasonable for cops to believe you would like a lawyer who is a dog.