Thank you for your email address. I check with my boss. He was not comfortable making an appointment with you, because his time is rather tight. Because it requires frequent overseas travel.
Thank you for your email I check with my boss. He was not easy to make an appointment with you. Because his time is quite tight I have to travel abroad frequently.
Thank you for your email. I check with my boss, he is to make an appointment with you. Because his time is very tight. Because of the need to travel abroad frequently.