You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am Stephen Baker. I am planning to change an existing reservation, due to health issue.Can you please change my reservation?

ASSISTANT: Please wait a while, let me check.

USER: Sure, take your own time.

ASSISTANT: There is no reservation on your name in our database.

USER: That's fine, thank you for your help.

ASSISTANT: Do you want to know anything else?

USER: No thanks.

ASSISTANT: Thanks for reaching us.