You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Amy Robinson.

ASSISTANT: How can I serve you today?

USER: Can you change my existing reservation due to my health issue?

ASSISTANT: Sure. Please, wait.

USER: Sure.

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

USER: Ok, No issues. Thank you.

ASSISTANT: Thank you for choosing us.