You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, how may I support you?

USER: I made a reservation earlier to go for a holiday trip with my friends, but due to some financial problems I want to change my existing reservation. Can you help me with this?

ASSISTANT: Sure, we are pleasure to help you. May I know your name please?

USER: My name is Kevin White.

ASSISTANT: Please wait for a while, let me check and back to you.

USER: Ok.

ASSISTANT: We are sorry to inform, there is no reservation found on your name.

USER: Ok, thank you.

ASSISTANT: Thank you.