You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Samuel Green. I want to change my travel dates in my previous reservation so can you please help me with that?

ASSISTANT: Sure, please wait for a moment to check your details.

USER: Ok, thank you.

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

USER: Oh! It's ok no problem.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your information.