You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Gregory Garcia.

ASSISTANT: Gregory, how can I help you?

USER: I am unable to travel at this moment, because of my health issues, so can you help me for cancelling my recent reservation?

ASSISTANT: Ok, please wait for a moment.

USER: Ok, I will wait for your reply.

ASSISTANT: Sorry, no reservation found under your name.

USER: Oh! It's ok no problem, thank you for your services.

ASSISTANT: Thank you for choosing us.