Someone wrote to me a few weeks ago and asked if I could give a talk on a certain date. She said she would contact me about the time of the talk. Since then I had not heard from her and assumed it was probably not happening or she would have contacted me to let me know what was happening.
She wrote today to remind me she said and she gave me the time - however I checked through my emails and as I thought, no time had been given in any of the previous emails as she mentioned she would be writing to let me know once it was confirmed. I have another appointment at almost the same time to meet a group of students, which is going to make it difficult to make both appointments.