Answer:
Formal expressions help in telling or showing a professional 'party' that you are capable.
Explanation:
Formal tone and words are very important in professional dealings.
The first thing to take into consideration is that you don't know the person you are speaking to, or even if you do , His/her position is higher than yours.
this formal expressions show that individual that you are respectful, capable, willing, self controlled and responsible.
your approach or verbal expressions matter much to that professional because that can determine his/her decisions.
If for example you are going for a job interview whether online or not, you are most probably aiming for a job approval. Your formal expressions would help that individual to determine who you are as a person.
