Reliability and trust are two basic and mutual foundations of any relationship, be it an employee-employer only. Companies prefer trustworthy and reliable people, which makes them appear responsible in their eyes so that they can be seen as a prospect as well. Therefore in this situation, you must prove your credibility and trustworthiness with your answer. Reliability means maintaining quality in your work and completing the work within the assigned time limit. So to make sure the recruiter sees this quality in you, give some examples from your past job where you constantly finished the projects before deadlines without compromising on the quality of work any single time. Additionally, talk about your punctuality, and add examples of accepting complex tasks. Highlight how you managed them when only a few people were keen on doing that. You must show why and how your previous employer trusted you with all the responsibility.