You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you today?

USER: I want to change an existing reservation due to my interview got preponed.

ASSISTANT: Can I have your name for the checking of existing reservation?

USER: I am Kimberly Lee.

ASSISTANT: Sorry, there is no reservation found under your name.

USER: No issue.

ASSISTANT: Thank you for reaching us.

USER: Thank you for consulting us.