You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

USER: Myself Raymond Smith.

ASSISTANT: How are doing Raymond?

USER: Due to heavy rainfall in my present location, I want to change my reservation which I have done last week. Will you please help me?

ASSISTANT: Sure, please wait for a minute.

USER: Ok.

ASSISTANT: Sorry, there is no previous reservation found on your name to change.

USER: No issue.

ASSISTANT: Thank you for contacting us.

USER: Thank you.