You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Alexander Nelson here.

ASSISTANT: How can I aid you at this moment? Nice to meet you Nelson.

USER: I want to cancel my recent reservation due to my grand father health issue, will you help me out?

ASSISTANT: That's sad to hear. I will help you with that and I hope to recovery of your grand father health. Please give me a moment.

USER: Sure.

ASSISTANT: Sorry Nelson, there is no reservation has found under your name to cancel.

USER: Ok, no issues.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your response.

ASSISTANT: You are welcome.