You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: Myself Rachel Carter. Due to some health issues, I cannot reach my destination. Can you help me in changing my existing reservation?

ASSISTANT: Sure. Give me a moment, while I check for your details.

USER: Ok.

ASSISTANT: Sorry to say that there is no reservation found on your name.

USER: No problem. Thank you.

ASSISTANT: You are welcome.