You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I aid you?

USER: Owing an emergence, I want to change my existing reservation. Can you please help me with it?

ASSISTANT: Sure, may I know your name for further process?

USER: My name is Jonathan Scott.

ASSISTANT:  Please wait I will revert you.

USER: Ok.

ASSISTANT: Sorry, no reservation was found on your name.

USER: Ok, no issues.

ASSISTANT:  Thank you for availing us.

USER: Thanks for the help.