You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I guide you today?

USER: Karen white here. Due to some personal health issue, I would like cancel my recent reservation. Can you help me?

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

ASSISTANT: Please wait for a minute.

USER: Sure.

ASSISTANT: I am sorry to say that there is no reservation found.

USER: It's ok, thanks for your information and help.

ASSISTANT: Thank you for contacting us. Have a great day.