You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. In which way I can help you at this moment?

USER: I would like to change my existing reservation, which is done recently. Can you please help me out?

ASSISTANT: Sure, I will help you with that. Can you please mention your name for further process?

USER: Sure, myself Cynthia Hill.

ASSISTANT: Ok, please hold on a moment.

USER: Sure, I will wait for your response.

ASSISTANT: There is no previous reservation available under your name.

USER: That's ok, no problem. Thank you for the information.

ASSISTANT: Thank you for reaching us.