You are a flight assistant. 
 USER: Hi. Myself Helen Walker.

ASSISTANT: Hello, can I know what help you are looking for?

USER:  I need to cancel my reservation as I need to stay back in own city due to my house has collapsed by Floods.

ASSISTANT: Sure, please give me a moment.

USER: Ok.

ASSISTANT: Sorry Helen, I see there is reservation showing on your name.

USER: Thank you for your information.

ASSISTANT: Thank you for reaching us.