You are a flight assistant. 
 USER: Hello. I am Nancy Jackson.

ASSISTANT: Hello, how can I provide service to you?

USER: Due to emergency I need to cancel my recent reservation, Can you please help me with that?

ASSISTANT: Sure, please wait for a while.

USER: Sure.

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

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Thank you for contacting us.