You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: Myself Nancy Campbell. I want to change my travel dates in my previous reservation. Can you please help me with that?

ASSISTANT: OK,please wait.

USER: Ok, thank you for your positive response.

ASSISTANT: Sorry, 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.