You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

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. Can you help me to change reservation?

ASSISTANT: Sure, can I know your name please?

USER: I am Rachel Smith.

ASSISTANT: Sorry Rachel Smith, there is no reservation found on your name.

USER: It's ok, no issues.

ASSISTANT: Is there anything else I help you today?

USER: No thanks.

ASSISTANT: Thank you for reaching us.

USER: Thanks for your valuable information.