You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself William Jones.

ASSISTANT: How can I assist you today?

USER: Can you please help me with changing my reservation due to my planned event got postponed?

ASSISTANT: Sure, will you please give me a moment.

USER: Sure, take your time.

ASSISTANT: Thanks for waiting, there is no reservation found under your name. Welcome, have a great day.

USER: It's ok fine. Anyway, thank you for your time.