You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you today?

USER: Myself Larry Davis from Chicago. I want to do some changes in the existing reservation because my friends are not able to come on the those dates. Can you please help me with that?

ASSISTANT: Sure, I am glad to help you. Please be on a hold.

USER: Thank you. Ok.

ASSISTANT: Sorry, there are no reservation found on your name in our records.

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

ASSISTANT: Thank you for reaching us.