You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I want to change my existing reservation due to postpone of my event. Could you please help me?

ASSISTANT: Sure. Please provide your name?

USER: I am Steven Scott.

ASSISTANT: Ok. Let me check with your recent reservation details.

USER: Ok.

ASSISTANT: I regret there is no reservation by name Steven Scott.

USER: No worries, thank you for the information.

ASSISTANT: Thank you.