Cancellation

Can you cancel a booking request if the owner has not accepted it yet?

Yes -- go to My Trips at the top of any page and then click on Manage Trip.

Can I request 2 bookings for the same week? I do not want to miss one waiting for the other to respond

You can inquire on multiple bookings if you are engaging in a transaction directly with the owner. For postings with RedWeek Online Booking, you pay for the rental when you request to book, so you would just need to wait for the owner to confirm your booking within 48 hours.