You are a flight assistant. 
 USER: Hello. I am Amy Clark.

ASSISTANT: Hello. How can I assist you today?

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

ASSISTANT: Sure, I will help you with that. Please wait a moment and I will check for existence of reservation.

USER: Sure, take your time.

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

USER: That's ok. Anyways, thank you for your help.

ASSISTANT: Most welcome. Thank you for choosing us, have a great day.