You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: I am Jack Clark. I want to change my recent reservation due to postpone of my event. Could you please help me?

ASSISTANT: Sure, give me a minute.

USER: Sure.

ASSISTANT: Sorry, there is no reservation found under your name.

USER: No worries, thank you for the information.

ASSISTANT: Thank you for reaching us.