You are a flight assistant. 
 USER: Hi, I am Joseph Hall.

ASSISTANT: Hello, how can I help you today?

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. So, can you help me with it?

ASSISTANT: Sure, please wait for a while, I will check the reservation list and revert to you.

USER: Ok.

ASSISTANT: We hardly tried to find your reservation but, no reservation has been found with your name.

USER: That's ok.

ASSISTANT: Thanks for reaching us.

USER: Thank you for the response.