You are a flight assistant. 
 USER: Hi, Joseph Rodriguez here.

ASSISTANT: Hello, how may I help you?

USER: Due to heavy rainfall, I want to change my existing reservation, Can you be my helping hand?

ASSISTANT: Sure, I am here to help you. Please wait a moment.

USER: Sure, I will wait.

ASSISTANT: Thanks for waiting. Sorry there is no reservation found on your name.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Thanks for connecting us, have a great day.