You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, how may I aid you?

USER: Owing to an emergency I had to request for this change reservation.

ASSISTANT: Sure, may I know your name?

USER: My name is Alexander Williams.

ASSISTANT: Please wait for a while, I will get back to you.

USER: Ok.

ASSISTANT: Unfortunately, there is no reservation found with your name.

USER: Thanks.

ASSISTANT: Thanks for availing us.