You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can 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?

USER: Sure, Benjamin Hernandez here.

ASSISTANT: Ok, please wait a minute.

USER: Sure.

ASSISTANT: Sorry, there is no reservation found on your name.

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

ASSISTANT: Thank you for reaching us.