You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, may I know how best I can help you today?

USER: I am Dennis Lopez. Due to sudden work, I want to change my reservation. Can you please help me with it?

ASSISTANT: Ok, please wait.

USER: Sure.

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

USER: Ok, not an issue. Thank you.

ASSISTANT: Thank you.