The key answer of exercise 3

1

• Conversation 1: He’s phoning to tell his friend he won’t be able to come to the restaurant later. 
• Conversation 2: She’s phoning to explain to her friend why she’s late and to let her know they won’t be able to come to the concert tonight.

2

• Conversation 1: His girlfriend had a panic attack earlier. She started breathing heavily and sweating. It might be stress related.
• Conversation 2: He had some kind of allergic reaction to something he ate. His lips swelled up while he was eating and he was struggling to breathe.