You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you?

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 proceed?

USER: Sure, David Hall here.

ASSISTANT: Please wait for a moment to check your details.

USER: Sure.

ASSISTANT: No reservation found on your name in my database.

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

ASSISTANT: Thank you for reaching us.