You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: Can you aid me to change my existing reservation?

ASSISTANT: Sure, can you share your name?

USER: Sure, I am Kimberly Davis.

ASSISTANT: Give me a minute for checking the reservation status.

USER: Sure.

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

USER: It's ok, thank you for the help.

ASSISTANT: Thank you for opting us.