You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you?

USER: Actually, I want to change my existing reservation which is done recently due to some problems, can you please help me in this?

ASSISTANT: Sure, I can help you with that. May I know your good name please?

USER: Sure, my name is Kathleen Jones.

ASSISTANT: Ok, please wait for a while.

USER: Sure, I will wait.

ASSISTANT: Kathleen Jones, there is no active reservation found under your name to do changes in that.

USER: Ok, not an issue. Anyways, thank you for your service.

ASSISTANT: Thank you for choosing us.