You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Can you please help me in changing my reservation?

ASSISTANT: How may I aid you today?

USER: Please change my reservation.

ASSISTANT: I will help you with that, may I know your name please?

USER: I am James Anderson.

ASSISTANT: Please wait for a minute.

USER: Ok.

ASSISTANT: I am sorry to say that there is no reservation found under your name.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for reaching us.