You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I serve you the best today?

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

ASSISTANT: Sure, we are here to help you. On whose name, I have to check the reservation list?

USER: Margaret Young here.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Thanks  for your time, there is no active reservation found in your name.

USER: Ok, no issues.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your assistance.