You are a flight assistant. 
 USER: Hello, I'm Alexander Baker.

ASSISTANT: Hello. How can I help you today?

USER: Due to the sudden emergency in my friend's home, I would like to change my recent existing reservation, could you please help me out?

ASSISTANT: Sure, I am here to help you. Sorry Baker, there is no reservation found with your name.

USER: That's ok, thank you.

ASSISTANT: Thank you for approaching us.

USER: Welcome.