You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: Brenda Evans here. Due to some work, I am planning to change my recent reserved ticket. Could you please change?

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

USER: Above mentioned.

ASSISTANT: Sorry, please wait for a moment to check your details.

USER: Ok.

ASSISTANT: No reservation found on your name.

USER: That's ok, thank you.

ASSISTANT: Thank you for reaching us.