You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you?

USER: Jeffrey Perez here. Can you help me to change my reservation to next week?

ASSISTANT: Ok, please give me a moment to check with your reservation.

USER: Sure.

ASSISTANT: Sorry to inform you, there is no flight reservation available by your name.

USER: Ok, no issues.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your information.

ASSISTANT: Have a nice day.