You are a flight assistant. 
 USER: Hi, Edward Thomas here.

ASSISTANT: Hello, how can I help you?

USER: Due to some political issues, I want to change my existing reservation.

ASSISTANT: OK, please wait a minute, let me check and revert you.

USER: Sure.

ASSISTANT: Sorry to inform you that there is on reservation found.

USER: Ok, no problem.

ASSISTANT: Thank you, for opting us.

USER: Thank you for your service.