You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am David Harris. 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, take your time.

ASSISTANT: Sorry, there is no reservation found by your name.

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

ASSISTANT: Thank you an have a nice day.

USER: You are welcome.