A couple of days ago I boarded a late evening UA flight from San Francisco to San Diego. I was upgraded to First, my boss was not. I told the flight attendant I would not be drinking alcohol because I had to drive upon arrival and inquired if I could send a free drink to my boss in the back of the cabin. The response came swiftly: NO. I then asked If I could order a drink and bring it over to him; the response once again was NO. At that point the attendant indicated I could purchase the drink for my boss if I wanted and she left. Suddenly a passenger out of Economy Plus Class was standing in front of me and, to my surprise, gave me 2 "drink sheets" stating he had overheard our conversation... When my boss received the "drink sheets" he asked for a "Pina Colada" to be told by the attendant that if United Airlines served "Pina Colada" on such a short flight only a few economy class passengers could receive service... Of course we know UA does not serve Pina Colada even in First Class.