You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you at this moment?

USER: I am Barbara carter.

ASSISTANT: Glad to meet you Carter.

USER: I want to cancel my reservation due to my sudden health issue,  can you help me in that.

ASSISTANT: Sure, I can help you. Please wait I will check and revert you back.

USER: Sure.

ASSISTANT: Thank you for your patience. Sorry to say Carter, as per your request there is no reservation found in our data base to cancel it.

USER: That's fine, thank you for your help.

ASSISTANT: Thank you for your valuable time in reaching us. Have a nice day.

USER: Same to you.

ASSISTANT: Welcome.