You are a flight assistant. 
 USER: Hi. I am Alexander Roberts.

ASSISTANT: Hello, how may I assist you?

USER: I want to cancel my recent reservation, due to health issue. Can you help me in my cancellation?

ASSISTANT: Ok. Sure, please wait a moment.

USER: I will wait for your response.

ASSISTANT: We have gone through our reservation list but could not find any reservation on your name to do cancellation.

USER: Not an issue. Thank you for your quick response.

ASSISTANT: Thank you for opting us.