You are a flight assistant. 
 USER: Hi, I am Debra Lewis.

ASSISTANT: Hello, how can I help you today?

USER: Owing to an emergency, my planned trip to sky diving with friends got postponed. So I request you to change my existing reservation.

ASSISTANT: Sure, please wait a moment.

USER: Sure.

ASSISTANT: Sorry to inform, no reservation found with your name.

USER: Ok, no worries at all. Thank you for your assistance.

ASSISTANT: Thanks for reaching us.