You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I aid you today?

USER: Owing to an emergency, my meeting with client got postponed. So I want you to change my existing reservation.

ASSISTANT: Sure, I am here to help you. Can you please mention your name?

USER: Sure, Samantha Smith here.

ASSISTANT: Sorry, no reservation found with your name.

USER: Ok, no worries at all.

ASSISTANT: Thank you for opting us.

USER: Thank you for your information.