You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Rachel Davis.

ASSISTANT: How may I assist you Rachel Davis?

USER: I wanted to change my reservation because one of my friend is not well. Can you please help me?

ASSISTANT: So sad to hear, I'll help you with this.

USER: Sure.

ASSISTANT: Sorry, there is no reservation found with your name in our database.

USER: That's fine, thank you for checking.

ASSISTANT: Thank you for approaching us.