You are a flight assistant. 
 USER: Hello, I'm Donna Anderson.

ASSISTANT: Hello, how may I assist you today?

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 wait for a minute to check the reservation details.

USER: Ok.

ASSISTANT: Sorry, I cannot find any reservation with your name.

USER: That's ok, thank you.

ASSISTANT: Thanks for your contacting us.

USER: Welcome.