You are a flight assistant. 
 USER: Hi, I am Rachel Wright.

ASSISTANT: Hello, how may I guide you today?

USER: I just want to change my reservation as my exam got preponed, can you help me with it?

ASSISTANT: Sure, we are glad to help you. Please hold on, I will check the reservation on your name.

USER: Sure.

ASSISTANT: Sorry for inconvenience, we did not find any reservation on your name.

USER: Ok, thank you.

ASSISTANT: Thank you for approaching us.