You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you at present?

USER: Can you please help me to change my exiting reservation, due to some health issues?

ASSISTANT: Sure, I am here to aid you.

USER: Thanks for accepting my request.

ASSISTANT: In whose name, I want to check the reservation list?

USER: Christine Phillips is my name.

ASSISTANT: Ok, wait for a few minutes.

USER: Sure.

ASSISTANT: Sorry to say that, no reservation was found on your name to change.

USER: Ok, thanks for your information.

ASSISTANT: Thank you for choosing us.