You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: I would like to change my recent reservation due to some health issues, can you please help me in changing?

ASSISTANT: Sure, may I know your name for checking?

USER: Myself Catherine Brown.

ASSISTANT: Give me a minute.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry, there is n active reservation found under your name.

USER: That's ok, no problem. Anyway thank you for the information.

ASSISTANT: Thank you for reaching us.