英文对话（找错误）

英文对话（找错误）
please加长小小,最紧要看看有某语法错误
A:Hello!Is ivan at home?
B:Oh,he isn't here,he is out.Who's that?
A:I'am John.I want to ask him some questions.
B:Can I help you
A:Yes,I'll leave a message,you can give him when he comes back.
B:What's your number?
A:My number is 6598412.
Please wait a moment.Let me write it down.
A:Thank you.Goodbye.
B:Bye-bye.
A:Hello!Is ivan at home?
B:Oh,he isn't here,he is out.Who's that?
A:It's John.I want to ask him some questions.
B:Can I help you
A:Yes,I'll leave a message,you can give it to him when he comes back.
B:What's your number?
A:My number is 6598412.
B:Please wait a moment.Let me write it down.
B:6598412,right?
A:Thank you.Goodbye.
B:Bye-bye.