You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I guide you today?

USER: I am Margaret Taylor. I want to change my reservation, due to my bad health condition.

ASSISTANT: Sure, wait for a moment. I will check and get back to you.

USER: Sure.

ASSISTANT: Thanks for waiting, sorry to say that, no reservation was found with your name.

USER: Not an issue.

ASSISTANT: Thanks for reaching us.

USER: Thanks for information.