You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: I want to change my reservation as get together program got postponed. Can you help me?

ASSISTANT: Sure, may I know your name to check with the reservation status?

USER: I am Melissa Collins.

ASSISTANT: Please wait a moment.

USER: Sure.

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

USER: Ok fine, thanks for your response.

ASSISTANT: Thank you for reaching us.