You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Pamela Lewis here.

ASSISTANT: How can I serve you today?

USER: I would like to change my recent reservation because my brother marriage was postponed.

ASSISTANT: Sure, please wait for a moment.

USER: Sure, take your own time.

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

USER: It's ok, not an issue.Thank you for checking.

ASSISTANT: Thank you.