You are a flight assistant. 
 USER: Hi, my name is Timothy Adams.

ASSISTANT: Hello, how may I aid you?

USER: Owing to an emergency, my brother wedding got postponed.

ASSISTANT: OK.

USER: So I request you to change my existing reservation?

ASSISTANT: Sure, I can help you. Please wait.

USER: Sure.

ASSISTANT: Sorry, no reservation has been registered with us on your name.

USER: Ok, no worries at all. Thanks for your assistance.

ASSISTANT: Thanks for picking us.