What is the iata number for hays travel?

The only way to get this answer is to contact Hays Travel directly. An IATA Number is a unique numeric code that distinguishes different travel agencies from one another in the travel industry. Think of it sort of like a Social Security Number- it's unique to you and only you- and it's not something you share with everyone. The only people who are given this set of numbers are people who work for that agency. So your best bet is to contact them directly about your inquiry.