You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I am planning to change my reservation, can you help me in that?

ASSISTANT: Sure, I am here to help you. May I know your name to check with the reservation status?

USER: I am Andrew Lewis.

ASSISTANT: Please wait a moment.

USER: Ok.

ASSISTANT: Thank you for waiting. Andrew Lewis, regret to inform that there is no active reservation found under your name to amend.

USER: That's ok, thank you.

ASSISTANT: Thank you for reaching us.