You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you today?

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

ASSISTANT: Sure, may I know your name to check for the previous reservation?

USER: Sure, Patricia Lee here.

ASSISTANT: Please allow me a moment.

USER: Sure.

ASSISTANT: There is no reservation found under your name.

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

ASSISTANT: Thank you for contacting us.