You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

USER: I am Amy Phillips.

ASSISTANT: Nice to meet you Amy.

USER: I want to change my existing reservation as my trip got postponed. Can you help me in this?

ASSISTANT: Sure, please wait for a moment.

USER: Ok.

ASSISTANT: Thanks for your time. But I am sorry to say that there is no flight reservation on your name to change it.

USER: Sad to hear, anyways thank you for your information.

ASSISTANT: Thank you.