You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist 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 Alexander Collins.

ASSISTANT: There is no reservation on your name.

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

ASSISTANT: Thank you.