You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you for today?

USER: I am Richard Martinez from Detroit. I want to change my travel dates in my previous reservation. Can you please help me with that?

ASSISTANT: Yes, I can help you. Give me a moment.

USER: Ok, thank you.

ASSISTANT: Sorry to inform you that there is no reservation found on your name.

USER: Oh! It's ok no problem.

ASSISTANT: Thank you for contacting us.

USER: Thank you for your information.