You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I do help full to you?

USER: I am Elizabeth Green, I want to cancel my reservation.

ASSISTANT: Sure, please give me a moment to check it.

USER: Ok, sure.

ASSISTANT: Ok, I am sorry that there is no reservation found for the name you have provided.

USER: It's ok, anyway thank you for the help.

ASSISTANT: Welcome.