You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I aid you?

USER: Amanda Thomas is here. I want to change my existing reservation due to meeting got postponed. Can you aid me in that?

ASSISTANT: Sure, please wait a moment I will check and let you know.

USER: OK.

ASSISTANT: Thank you for waiting. Sorry, we did not found any reservation on your name.

USER: Ok, no problem. Thank you for your response.

ASSISTANT: Thank you for reaching us.