L:Hello!(Is that Mr Li)?
T:Yes,who is it?
L:It's me.I'm sorry to trouble you.(Can I borrow your bike?)
T:Certainy.(Is your bike broken?)
L:No,I've lost my key to the bike.But I have to go to see my uncle.
T:I see.(When will you return it to me?)
L:I think I'll return it before 6:00 p.m
T:(OK.)Here's the key.I hope everything goes well.Bye!
L:Thank you very much!Bye!