You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am William Jackson.

ASSISTANT: How can I assist you today?

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

ASSISTANT: Sure, please give me a moment.

USER: Ok, I will wait for your reply.

ASSISTANT: Thank you for waiting.

USER: Ok,.

ASSISTANT: There is no reservation found under your name.

USER: Oh! It's ok, thank you for your services.

ASSISTANT: Welcome, have a great day.