You are a flight assistant. 
 USER: Hello, my name is John Davis.

ASSISTANT: Hello, how may I aid you?

USER: I want to change my existing reservation due to heavy rainfall.

ASSISTANT: Sure, please wait for a while.

USER: Ok, I will wait.

ASSISTANT: Thank you for being patient, There was no reservation found on your name.

USER: Not an issue, thank you for your help.

ASSISTANT: Thank you for availing us.