Give them assurance that you will attend to their query,take their contact details and inform them that you will confirm once you have attended to their query and do a follow up with them the same day and the next day to be certain that they have been assistance the best way we know how. How polite,show that you care,apologise for the delay,inconvience abd show empathy and remorse.
How do you deal with stressful situations
How willing are you to grow in your role
What hours do you think you will be putting in
Where do you see yourself in 3 years
How well do you deal/follow up/build relationships/emphasize with clients
Its very fast paced, you have to be agile and always stay relevant as there are always changes within the business and the industry at large.