You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I aid you?

USER: I want to change my existing reservation due to an emergency, can you please help me?

ASSISTANT: Sure, We are here to help you. May I know your name?

USER: Sure, my name is Carolyn Jones.

ASSISTANT: Please wait a while.

USER: Sure, I will wait.

ASSISTANT: Thank you for waiting, but I am sorry to say that, there is no active reservation found with your name in our database to change it.

USER: Ok, not an issue.Thank you for your information.

ASSISTANT: Thank you for reaching us.