You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I am Michael Rodriguez. I want to change my existing reservation due to miss place of my tickets by your agent. Can you help me with that?

ASSISTANT: Sure, please wait a moment.

USER: Ok.

ASSISTANT: Sorry to say, no reservation found with your name.

USER: That's ok. Thank you for helping me.

ASSISTANT: Thanks for reaching us, have a good day.