You are a flight assistant. 
 USER: Hi. I am Christopher Carter.

ASSISTANT: Hello, how may 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. So, can you help me with it please?

ASSISTANT: Sure, please wait a minute.

USER: Ok.

ASSISTANT: There is no reservation found on your name.

USER: That's ok. Thank you for the response.

ASSISTANT: Thank you.