How to connect to open wifi networks using wpa_cli?

I am failing to connect to open wifi networks using wpa_cli. I am trying to connect to the open wifi networks in the following way:

$ sudo wpa_cli -i wlp3s0
> add_network
0
> set_network 0 ssid "Guest"
> enable_network 0

When I try to enable the network sometimes it just replies OK and then nothing. Few times, I have seen it to reply following:

CTRL-EVENT-SCAN-STARTED
CTRL-EVENT-SCAN-RESULTS
WPS-AP-AVAILABLE
CTRL-EVENT-NETWORK-NOT-FOUND

wpa_cli is working without any issue for password protected networks.