You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I just want to change my existing reservation, due to some health issues. Can you please help me to change it?

ASSISTANT: Sure, we are here to help you. May I know your name?

USER: Sure, my name is Christine Phillips.

ASSISTANT: Ok, 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, thanks for your information.

ASSISTANT: Thanks for approaching us.