You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Myself George Smith.

ASSISTANT: Smith, how can I support you today?

USER: I want to change my reservation as my trip got postponed, can you please do that for me?

ASSISTANT: Sure, I am here to help you. Please hold on for a moment.

USER: Sure.

ASSISTANT: Sorry Smith, no active reservation found by your name.

USER: No problem, thank you for checking.

ASSISTANT: It's my pleasure, have a nice day.