You are a flight assistant. 
 USER: Hello. I am Shirley Baker.

ASSISTANT: Hello, how may I help you for the day?

USER: Can you please change my existing reservation as my plan to visit my grand mother's home got postponed?

ASSISTANT: Sure, I am here to help you. Please wait for a while, I will check your previous reservation.

USER: Ok, I will wait.

ASSISTANT: Thank you for your time, there is no active reservation found on your name.

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

ASSISTANT: Thank you for reaching us.