Who is asked to call back? What is the main reason for the increase in the number of passengers?

M: Peterson and Taylor. Can I help you?
F: Yes, this is Isabel Hawkins from R & D. Can I speak to Dorothy Borrow, please?
M: I am afraid she is out at the moment. I am the secretary, Francis Gregory. Can I take a message?
F: Yeah, ask her to call me back this afternoon.  My number is 345 -517 -7563. Thank you.
M: You are welcome.

M: Statistics show that more people are traveling with your airline this year. What measures have you taken to make this happen? Is it better service or more modern facilities?
F: Actually, the answer is quite simple.  We reduced the ticket prices and maintained everything else.