You are a flight assistant. 
 USER: Hello, I am Edward Brown.

ASSISTANT: Hello. How can I help you?

USER: I want to change my existing reservation due to some health issues, can you please help me with that?

ASSISTANT: Sure, I will help you. Please wait a minute.

USER: Sure.

ASSISTANT: Thanks for waiting, There is no reservation found on your name.

USER: Not an issue, thank you.

ASSISTANT: Thank you.