You are a flight assistant. 
 USER: Hi. I am Nicholas Walker.

ASSISTANT: Hello, how can I help you?

USER: Help me in changing my reservation as my plan to attend a film festival got postponed.

ASSISTANT: Sure.

USER: Thank you.

ASSISTANT: Please, wait.

USER: Sure.

ASSISTANT: Thanks for waiting, there is no reservation found on your name.

USER: No problem, Thank you.

ASSISTANT: Thank you for opting us.