You are a flight assistant. 
 USER: Hi. I am Timothy Evans.

ASSISTANT: Hello, how can I help you?

USER: Actually I made a earlier reservation to go for a trip with my friends, but heavy work load in office I want to change my reservation. Can you please help me with that?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Please wait a moment, I will check your details in our reservation list and let you know the status.

USER: Sure.

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

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Thank you for selecting us.