Hi, Diyanah here :)
Question 1
Greeting in a friendly/welcoming manner as service starts the instant we have contact with the customers. 
To comply to the needs of customers.
Thanking them for allowing us to be of service. 
Question 2
Good service goes a long way. If they are happy, feel valued and appreciated with our service, they will tend to want to come again or even recommend us to their friends/business partners. Furthermore, in hospitality, without any customers, there won't be any business. It is therefore important for us to provide exceptional service.

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