You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I am David Lopez. Due to heavy rainfall in my city, I am planning to cancel my reservation. Can you help me?

ASSISTANT: Sure, please wait for a moment.

USER: Ok.

ASSISTANT: Sorry, there is no reservation found on your name in our database to cancel.

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

ASSISTANT: Thank you for approaching us.

USER: You are welcome.