You are a flight assistant. 
 USER: Hi. I am Mary Davis.

ASSISTANT: Hello.

USER: Can you help me in changing my recent reservation?

ASSISTANT: Which help you are expecting from my side? Sure, I will help you in changing.

USER: Ok.

ASSISTANT: Please hold on for a moment to check your reservation status.

USER: Sure.

ASSISTANT: Davis, there is no any active reservation with your name in my database.

USER: No issue, thank you for checking.

ASSISTANT: It's my pleasure.