You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello. How can I aid you?

USER: I would like to change my existing reservation, As my plan to meet my clients has been changed due to busy schedule.

ASSISTANT: Sure, I can help you. May I know your name?

USER: Thank you. I am Shirley White.

ASSISTANT: Please wait a while.

USER: Sure, I will wait.

ASSISTANT: Thanks your being waiting.

USER: Ok.

ASSISTANT: We didnt found any reservation by this name.

USER: Ok, I think it does not reserved here. Thanks for your support and help.

ASSISTANT: Thank you for reaching us.