求助一段英语对话，非常简单的

-Hello?
-Oh, nice to meet you, Jack!
-Nice to meet you,too, Mike! And Happy Birthday!
-Thank you very much. Why are you standing outside? Come in, please!
-Here is the gift for you!
-How nice it is! Thanks a lot.
-It's my pleasure.
-Help yourself to the food and drinks!
-I will! Thank you.
(Jack's cell phone rings)
-Oh, excuse me!
-Go ahead, please.
(After the call)
-I'm so sorry that I have to leave!
-Why?
-I'm sorry, but my mum was send to hospital just now.
-I'm sorry to hear that. However, I have to say good bye！
-Bye

A: hi, I'm coming!
B: Welcome! i'm very glad to see you at the party!
A: how nice it is! i think i'll enjoy myself here.
B: yeah, just help yourself at home.
A: excuse me, I have a phone call.
......
A: i'm very sorry. but i really have something important to do.
There is something wrong with the document we need on tomorrow's
meeting. I have to go now.
B: what a pity. Do come next time.
A: sure.