You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today?

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

ASSISTANT: Sure, may I know your name to check further?

USER: Sure, Angela White here.

ASSISTANT: Please wait.

USER: Sure.

ASSISTANT: Sorry, no reservation found on your name in our portal to change it.

USER: Ok, no issues. Thank you for your assistance.

ASSISTANT: Thank you for contacting us.