You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: I need to change my reservation as my interview got postponed. Can you help me?

ASSISTANT: Sure, We are here to assist you. May I know your name to trace your details?

USER: I am Jerry Martin.

ASSISTANT: Give me a minute.

USER: Sure.

ASSISTANT:  Thank you for waiting, but I am sorry to say that, there is no active reservation found with your name in our database to change it.

USER: Ok fine, thanks for your assistance.

ASSISTANT: Thank you for reaching us.