updates for open sourcing

[indam23]

What changed:

• Closes https://github.com/RasaHQ/helpdesk-assistant/issues/2
• [x] update config & requirements for 1.8
• [x] Resolve error when email not found in database (currently breaks story)
• [x] Ensure fallback behaviour in flows (that unexpected input is handled)
• [x] Clean up responses phrasing
• [x] Add NLU data

[github-actions[bot]]

Intent Cross-Validation Results (5 folds)

class	support	f1-score	confused_with
macro avg	85	0.9166	N/A
weighted avg	85	0.9164	N/A
inform	13	0.9630	N/A
out_of_scope	12	0.9167	bot_challenge(1)
open_incident	11	0.8182	problem_email(1), help(1)
password_reset	9	1.0000	N/A
greet	8	0.9333	inform(1)
help	7	0.9333	N/A
problem_email	7	0.7692	open_incident(2)
thank	6	0.9091	out_of_scope(1)
bot_challenge	6	0.9231	N/A
goodbye	6	1.0000	N/A

Entity Cross-Validation Results (5 folds)

entity	support	f1-score	precision	recall
priority	9	0.8750	1	0.7778
micro avg	9	0.8750	1	0.7778
macro avg	9	0.8750	1	0.7778
weighted avg	9	0.8750	1	0.7778