You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: Please change the reservation with the name of Larry Allen, as there is an emergency work to attend.

ASSISTANT: Sure, please wait a minute.

USER: Ok.

ASSISTANT: Thank you for waiting. Sorry to say no reservation found on your name.

USER: Fine.

ASSISTANT: Thank you for reaching us, have a nice day.

USER: Thank you for your quick response.