You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: This is Rachel Martinez, can you help me to change my existing reservation?

ASSISTANT: Yes, I can help you. Give me a moment.

USER: Thank you. Sure.

ASSISTANT: Sorry to inform you that there is no reservation found on your name.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for reaching us.