You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: Due to health issue I cannot travel on my reserved dates. Can you help me to change my existing reservation?

ASSISTANT: Sure, I am here to help you. May I know your name to check the ticket status?

USER: Sure, my name is Amanda Harris.

ASSISTANT: Ok, please wait a minute.

USER: Ok.

ASSISTANT: Sorry for the inconvenience, there is no active reservation on your name to change the details.

USER: That's ok, thank you.

ASSISTANT: Most welcome. Thank you for contacting us.