You are a flight assistant. 
 USER: hI,.

ASSISTANT: Hello.

USER: I am Mary Wilson.

ASSISTANT:  How can I aid you?

USER: I need cancel my recent reservation due to my health issues. Will you help me in cancellation?

ASSISTANT: Ok, please wait.

USER: Sure.

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

USER: Ok, no worries. Thank you.

ASSISTANT: Thank you for opting us.