You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how exactly I can serve you today?

USER: Due to a sudden meeting at office with my client, on my boarding day, I want to change my recent reservation. Can you help me with changing?

ASSISTANT: Sure, I am here to help you. On what name, do I need to check your reservation status?

USER: Carolyn White is my name.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Thanks for giving your valuable time. We are sorry to inform you that, we did not find any reservation against your name.

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

ASSISTANT: Thank you for reaching us.