You are a flight assistant. 
 USER: Hi, I am Virginia Brown.

ASSISTANT: Hello, how may I aid you today?

USER: Owing to an emergency, my meeting with project manager of Microsoft got postponed. So I request you to change my existing reservation?

ASSISTANT: Sure, I will help you to change your reservation. Please wait for a moment, while I check for the reservation.

USER: Sure.

ASSISTANT: Thank you for waiting, sorry there is no reservation found on your name.

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

ASSISTANT: Thank you for reaching us, we hope see you again.