You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

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

ASSISTANT: Sure, please provide me your name?

USER: Yes, I had done the reservation on the name Michelle Clark.

ASSISTANT: Give me a moment.

USER: Sure, take your own time.

ASSISTANT: Michelle Clark. I regret to inform that there is no reservation by your name.

USER: That is ok, thank you for providing the information.

ASSISTANT: Thank you for reaching us.