Engage in petty argument or bargaining. (Oxford Dictionaries)
To argue with someone, especially about the price of goods. (Cambridge Dictionary)
If you say that people are dickering about something, you mean that they are arguing or disagreeing about it, often in a way that you think is foolish or unnecessary. (Collins Dictionary)
To deal, swap, or trade with petty bargaining; bargain; haggle. (Dictionary.com)
To try to arrange matters by mutual bargaining: (Dictionary.com)
-Do you dicker with them?
-She looked at him in bewilderment. Dicker?
-Bargain, haggle, negotiate. You know dicker.