Be attentive: When talking to that person pay close attention to what he or she is saying.

Don't argue: As you listen, you will find that he/she has a point of view that is different from your own. Do not be in rush to argue, or stick rigidly to your stand.

Find common ground: Try and find some common ground. It isn't as difficult as it sounds. If you listen carefully, you will find some areas of agreement. Use the points you both agree on to build a reasonable discussion.

Be tactful: You don't have to bend backwards to agree with the other person. Instead you should stand your ground but do so tactfully.

Be flexible: If both parties are rigid, you will get nowhere. Being a little flexible without compromising on your stand can pay dividends.

Talk to your boss: If nothing seems to work, tell your boss and request his/her intervention.