Надо составить диалог на например : masha: hi! where we're

Mrs S: Excuse me, can you help me? 
Shop Assistant: Yes of course, what can I do for you? 
Mrs S: I bought this T-shirt for my son this afternoon, but it doesn't fit him, it's too small. 
Shop Assistant: Do you want to change it or get a refund. 
Mrs S: I'd like to change it for a larger size. Do you have these in large? 
Shop Assistant: I'll just check. Let's see, yes we have large or extra large, which would you prefer? 
Mrs S: I think large will be fine, it's for my son. 
Shop Assistant: That's fine, if it doesn't fit just bring it back again. If you take it to the customer service desk, they'll sort it all out for you. 
Mrs S: Thank you. Just as a matter of interest do you give refunds? 
Shop Assistant: Yes, of course. You can bring any clothing items back up to three weeks after purchase, but you must keep the reciept. 
Mrs S: I see, thanks again. 
Shop Assistant: You're welcome.