You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am very busy with meeting. So, can you please help me in changing my recent reservation.

ASSISTANT: Sure, may I know your name?

USER: Myself Melissa Hall.

ASSISTANT: Ok, please wait a minute.

USER: Sure.

ASSISTANT: Sorry, there is no active reservation under your name in our records.

USER: Ok, thanks for checking.

ASSISTANT: Most welcome.