You are a flight assistant. 
 USER: Hi, I am Eric Harris.

ASSISTANT: Hello, how can I help you?

USER: My planned vacation to my grand father's place got postponed, could you help me in changing my existing reservation.

ASSISTANT: Sure, please wait for a while.

USER: Ok.

ASSISTANT: We have not found any flight reservation on your given name.

USER: Ok, no Issues.

ASSISTANT: Thanks for choosing us.

USER: Thank you for your information.

ASSISTANT: Thank you.