You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today?

USER: Owing to an emergency, I want to change my existing reservation.

ASSISTANT: Sure, we are here to help you. Kindly share your name.

USER: Sure, Patrick Lopez here.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: Sorry to inform, no reservation found on your name in our records.

USER: Ok, no issues. Thank you for your information.

ASSISTANT: Thank you for reaching us.