You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. May I have your name?

USER: I am George Roberts.

ASSISTANT: How may I be your helping hand for the day?

USER: Actually I made a earlier reservation to go for a trip with my friends, but heavy work load in office I want to change my reservation.

ASSISTANT: Ok.

USER: Can you help me in change an existing reservation?

ASSISTANT: Please standby, I have to check the reservation list and know about the details.

USER: Ok.

ASSISTANT: Thanks for waiting. But, I did not get any reservation on your name in checking the list.

USER: Ok, not an issue.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your information.