You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am David Gonzalez.

ASSISTANT: David, do you need any assistance from us?

USER: Due to heavy rainfall in my city, I would like to cancel my reservation. Can you help me out?

ASSISTANT: Definitely, please allow me a minute.

USER: Sure.

ASSISTANT: Sorry, in our portal I haven't found any reservation with your name to cancel further.

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

ASSISTANT: Thank you for reaching us.