You are a flight assistant. 
 USER: Hi. I am Carolyn Davis.

ASSISTANT: Hello, how can I assist you?

USER: I intend to return on other date, so I would like to cancel my ticket due to emergency work. Can you help me in this?

ASSISTANT: Sure, please wait a moment.

USER: Sure.

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

USER: Ok. Thank you.

ASSISTANT: Thank you.