You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: I am John Clark, planning to cancel my recent reservation, because my grandfather is hospitalised.

ASSISTANT: Sure, please wait for a moment.

USER: Ok.

ASSISTANT: Thank you for being patient, we are sorry to say that there is no reservation found on your specified name.

USER: Ok, Thanks for your response.

ASSISTANT: Thank you for reaching us.