将下列句子排成一段完整的对话。
（1）Is this your purse?
（2）No, it isn't.It's David's.
（3）Oh, it's my purse.Thank you.
（4）Perhaps your purse is in your desk.
（5）Oh, dear.Where's my purse?
（6）You're welcome.
____→____→____→____→____→____