You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Anthony Miller.

ASSISTANT: How may I help 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. Will you help me with that?

ASSISTANT: Please wait for a moment.

USER: Thank you for accepting my reservation.

ASSISTANT: Sorry, there is no reservation matching with your name in our portal to make changes further.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Most welcome.