If you do not have business cards, you can help the customer remember you by:

Writing "thank you" on the sales receipt and signing your name is effective because it provides the customer with a physical artifact that reinforces your connection to them. The receipt is an item they are likely to keep or look at again, and having your name personally signed creates a more memorable interaction. This small gesture shows appreciation and instills a sense of personal care, which can enhance the customer's overall experience and satisfaction.

The other options, while they may contain elements of customer service, do not provide the same lasting reminder or personal touch. For instance, asking the customer for something to write on may come off as unprofessional or disruptive. Mentioning awards could be seen as self-promoting and may not resonate with the customer's immediate needs. Using your name often in conversation can create familiarity, but without a tangible reminder, it may not be as effective in helping the customer recall your identity later.