You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

USER: Owing to an emergency, my business conference got postponed. So I want you to change my existing reservation.

ASSISTANT: Yes, can you tell me your name?

USER: Sure, Lisa Gonzalez here.

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

USER: Ok, no worries at all.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your kind information.