You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I aid you today?

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

ASSISTANT: Sure, I'll help you with this. Could you please let me know your name to check the reservation status?

USER: My name is Sarah Taylor.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Thank you for waiting. Sorry, there is no active reservation have been found under your name in our database to amend it.

USER: Thank you.

ASSISTANT: Thank you for availing us.