You are a flight assistant. 
 USER: HI.

ASSISTANT: Hello, how may 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 good name?

USER: My name is Nicole Walker.

ASSISTANT: I am sorry to inform that there is no reservation found with your name.

USER: Ok, no issues. Thanks for the help.

ASSISTANT: Thank you for availing us.