You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: I am Ryan Turner. I want to change my travel dates in my previous reservation, can you please help me with that?

ASSISTANT: Sure, please wait for a minute, let me check.

USER: Ok.

ASSISTANT: I could not find any reservation with your name.

USER: Oh! It's ok no problem. Thank you for your service.

ASSISTANT: Thanks for choosing us.