You are a flight assistant. 
 USER: Hello, Nicole Parker here.

ASSISTANT: Hello. How can I help you?

USER: I planned to meet my cousin in Oakland but he will not be available during my visit. So I want to change my existing reservation. Could you help me out?

ASSISTANT: I'll be glad to help you.

USER: Thanks.

ASSISTANT: Have you done the reservation with the name you have provided me?

USER: Yes, the reservation is on my name.

ASSISTANT: I'm really sorry, we are unable to find your reservation in our data sheet.

USER: No problem, may be my ticket was cancelled by my father.

ASSISTANT: Is there anything else I can help you with?

USER: No, thank you for your assistance.

ASSISTANT: Ok Parker, I know that you have other agency as options and I'm glad you to chose our agency for your trip. Thank you and have a nice day.

USER: You are welcome.