Make some dialogs with these situation,you have promised your friend to accompany her in this afternoon to bookstore,but you cancel it.

A : hey, i will go to the bookstore at 1pm, when will you come?
B : oh im sorry, i can't go today
A : but you've promised to accompany me to the bookstore last week...
B : i'm really sorry, my mom is sick and i need to accompany her... i'd make it up to you next time.
A : alright... thats okay, hope your mom recovered soon.
B : Thank you

Answer:
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Elsa: "I'm sorry Helen because I can not accompany you to the bookstore this afternoon.

Helen: "Why did you cancel it, Elsa?

Elsa: "once Again I'm sorry, because I have to help my mom cook in the kitchen.

Helen: "All right, Elsa.