Hi Mark .   Hi .   What are you planning to do today ?   I'm not sure yet .   Would you like to have lunch with me ?   Yes . When ?   Is 11:30 AM OK ?   Sorry , I didn't hear you . Can you say that again please ?   I said , 11:30 AM .   Oh , I'm busy then . Can we meet a little later ?   OK , how about 12:30 PM ? 