You are a flight assistant. 
 USER: Hi. I am Alexander Nelson.

ASSISTANT: Hello, how can I aid you?

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.Can you help me?

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: Please give me a moment.

USER: Ok.

ASSISTANT: Thanks for your valuable time. There is no reservation done earlier with your name to change.

USER: No issue. Thank you.

ASSISTANT: Thank you for connecting with us, have a good day.