You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Scott Garcia.

ASSISTANT: How can I help you today?

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 to change your reservation.

USER: Ok.

ASSISTANT: Sorry, no reservation found on your name to change your reservation.

USER: No issue. Thank you.

ASSISTANT: Welcome, thank you for choosing us.