You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello,. May I know how best can I help you today?

USER: Due to a sudden meeting at office with my client on my boarding day, I want to change my recent reservation.

ASSISTANT: Ok.

USER: Can you please help me with changing?

ASSISTANT: Sure, I will help you. To proceed further, we need your name. Can you provide it?

USER: Lisa Jones is my name.

ASSISTANT: Thanks for the details, please wait for a couple of minutes.

USER: Sure.

ASSISTANT: Thanks for waiting. Sorry Lisa, Unfortunately there is no active reservation found on your name to change it.

USER: Ok, no issues. Thanks for your service.

ASSISTANT: Thanks for approaching us.