You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I am Samantha Hill. I want to change my existing reservation, due to some health issue.

ASSISTANT: Ok.

USER: Can you please help me for changing my reservation?

ASSISTANT: Sure, we are here to help you. Wait for some time I will check and get back to you.

USER: Sure.

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

USER: Ok, Thank you for your service.

ASSISTANT: Thanks for approaching us.