I haven't played this game, but this is what MaG's walkthrough says:
Go back to Seagull. Talk to Seagull about the prompter. He will make the reservation for dinner.
Seagull gives Rufus a dinner invitation to be given to Lady Goal.
Lady Goal: Go to the tavern. Use the remote on Baby Goal. Select the right side Goal to change to Lady Goal.
Talk to her and then give her the invitation.
Which I'm guessing you've already done? Let's wait and see if anyone else knows what the problem might be.
"Bleat, Watson -- unmitigated bleat!" ~ Sherlock Holmes