You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I be your helping hand today?

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

ASSISTANT: Sure, I can change your reservation right now. Before that I need to know your good name please?

USER: Kimberly Turner.

ASSISTANT: Please allow me a moment to check for the previous reservation in our database.

USER: Sure.

ASSISTANT: We are sorry to say that, there is no active reservation found on your name.

USER: Ok, no issues. Thank you.

ASSISTANT: Thanks for reaching us.