You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: Please help me with changing my reservation due to some changes in the plan of my trip with my colleagues.

ASSISTANT: Sure, I will help you with that. May I know your name to check your details in our database?

USER: Kevin Allen here.

ASSISTANT: Please wait for a minute, I will check with the reservation and revert to you.

USER: Ok.

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

USER: No problem, Thank you.

ASSISTANT: Thank you for opting us.