You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: Myself Donna Carter, can you help me to change my reservation which is existing?

ASSISTANT: Sure, please allow me a moment to check for your reservation status.

USER: Ok, please take your own time.

ASSISTANT: Sorry Carter, there is no active reservation have been found under your name in our database.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for reaching us.