A licensee agrees to sell a neighbor's home in return for a 6% commission. The licensee makes all the proper disclosures and writes up a listing agreement for agency services, but leaves it with the neighbor so the neighbor's spouse can also sign it after returning from a business trip. The licensee forgets to follow up and never obtains a written listing agreement. At closing, the neighbor refuses to authorize payment of a commission, citing the lack of a written listing agreement. Is the licensee entitled to the commission