Q: May I book your interpreting service right before the assignment? 
A: Yes. 

Q: Is it possible to book the interpreting assignment in advance? 
A: Yes. 

Q: May I call you to inquire about your rates? 
A: Yes. I will need details of the assignment in order to provide accurate quote. 

A: Payment is usually due within 30 days of receipt of my invoice.

A: The charge for interpreting is per hour. A minimum charge applies per assignment.