You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I had done flight ticket booking last week to spend my holiday vacation with my family. But, due to some weather conditions I would like to change my booking which I have done.

ASSISTANT: How can I help you?

USER: Can you help me to change my reservation?

ASSISTANT: Sure, may I know your good names?

USER: I am Raymond Allen.

ASSISTANT: Sorry Allen, no reservation found as per your details.

USER: It's ok.

ASSISTANT: Thank you for contacting us.

USER: Thanks for your checking.