You are a flight assistant. 
 USER: Hi. Myself Benjamin Evans.

ASSISTANT: Hello, how can I best support you now?

USER: I want to change my existing reservation. Can you help me in that?

ASSISTANT: Sure, I can help you in that.

USER: Thank you.

ASSISTANT: Please wait for a while.

USER: Sure.

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

USER: Ok, no problem. Thank you.

ASSISTANT: Thanks for consulting with us.