How to say "Don't count on me" in Cantonese? The context:

A: Want to get lunch on Saturday?

B: Don't count on me. My game may last until 1 PM.

Several suggestions were offered for how to say, "Don't count on me" in Cantonese, but none seemed right.

Here were three suggestions, but none had the right connotation:


無遇我
無依賴我
無問我


What's the right way to say, "Don't count on me" in Cantonese?

Thanks!
In your situation, the most colloquial and natural expression that I can think of is "我嚟得就嚟” （If I can come, I will.) The speaker is not committing, nor is s/he ruling out coming. 

Another expression closer to "don't count on me/ don't rely on me (to do something, not necessarily joining the speaker for lunch)" is "唔好旨意嗮我。”