You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: Owing to an emergency, I need to change my existing reservation. Can you help me out?

ASSISTANT: Sure, we are mirthful to help you to change your reservation.

USER: Thank you.

ASSISTANT: May I know your name?

USER: Sure, Gary Moore is my name.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Sorry to say that, there was no reservation found on your name.

USER: Ok, no worries. Thank you for your time.

ASSISTANT: Thank you for availing us.