On the telephone

Tracy:      Hello, can I speak to Alex.
Alex:       This is Alex, who is speaking?
Tracy:      Hi, this is Tracy.
Alex:        Hi Tracy. What are you doing?
Tracy:      Oh, I'm just watching TV. What are you doing?
Alex:       Well, I'm cooking dinner.
Tracy:      What are you cooking?
Alex:       I'm baking some potatoes, boiling some carrots and       grilling  a steak.
Tracy:      It sounds delicious.
Alex:       What are you doing for dinner tonight?
Tracy:     Well, I don't have any plans...
Alex:       Would you like to come over for dinner?
Tracy:     Oh, I'd love to. Thanks.
Alex:      Great. Mary and Jack are also coming. They are arriving at seven.
Tracy:     OK, I'll be there at seven, too.
Alex:      OK, see you then. Bye.
Tracy:     Bye.