You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: Owing to an emergency, I want to cancel my reservation. Can you help me out?

ASSISTANT: Sure, I will help you to cancel your reservation.

USER: Good to hear that from you.

ASSISTANT: Sorry, there is no reservation found on your name to cancel.

USER: Please check for the details on the name of Alexander Lee.

ASSISTANT: Ok. I have rechecked with the name Alexander Lee, but there is no reservation found on your name.

USER: That's ok, thank you.

ASSISTANT: Welcome.