You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I oblige you today?

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

ASSISTANT: Sure, please share your good name?

USER: Sure, Jason Hernandez here.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Thank you for waiting, there is no active reservation found with the given name.

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

ASSISTANT: Thank you.