You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you today?

USER: I need to change my reservation due to urgent meeting, can you help me?

ASSISTANT: Sure, may I know your name?

USER: I am Jerry Hall.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: Sorry, there are no active reservations found on your name to change.

USER: That's ok. Thank you for your help.

ASSISTANT: Thank you for reaching our service.