You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you today?

USER: I want to change my existing reservation due to heavy rainfall, can you please help me with that?

ASSISTANT: Sure, may I know your name to proceed?

USER: My name is Edward Turner.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Sorry to say that, there is no reservation found on your name in our records.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for opting us, have a good day.