You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Carol Williams here.

ASSISTANT: How can I assist you?

USER: I want to cancel my recent reservation help me with it.

ASSISTANT: Ok, I will check with that one. Please wait.

USER: It's ok.

ASSISTANT: Ok, I am unable to find the ticket to cancel the ticket.

USER: Anyway thank you for the help.

ASSISTANT: Most welcome.