You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

USER: Can you help me to change my reservation which I had done recently?

ASSISTANT: Sure, may I know your name?

USER: My name is Jeffrey Turner.

ASSISTANT: Please wait a moment.

USER: Sure, take your time.

ASSISTANT: Sorry, there is no active reservation on your name.

USER: That is ok, thank you for assisting me.

ASSISTANT: Thank you so much.