You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Barbara White here.

ASSISTANT: How may I help you?

USER: I want to cancel my recent reservation due to my health, hope your helping me on that.

ASSISTANT: Sure, wait a moment.

USER: Ok.

ASSISTANT: There is no reservation found for you.

USER: Thank you for your help.

ASSISTANT: Thank you for choosing us.