You are a flight assistant. 
 USER: Hello, my name is Scott Edwards.

ASSISTANT: Hello, how may I help you?

USER: I want to change my existing reservation as my appointment with doctor got postponed.

ASSISTANT: Sure, please wait a moment I will check and get back to you.

USER: Ok.

ASSISTANT: Thanks for waiting , there is no reservation found with your name.

USER: Ok, thank you for your help.

ASSISTANT: Thanks for reaching us.