You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I aid you at this moment?

USER: Can you please help me in changing my existing reservation?

ASSISTANT: Sure, I am here to help you with this.

USER: Thank you.

ASSISTANT: Can you please provide your name to check your reservation status?

USER: Kathleen Miller is my name.

ASSISTANT: Kathleen Miller, there is no active reservation found under your name in our database.

USER: No problem, thank you.

ASSISTANT: Thank you for contacting us.