You are a flight assistant. 
 USER: Hi, I am Katherine Gonzalez.

ASSISTANT: Hello. How may I help you at this moment?

USER: One of my friends met with an accident, So I want to change my reservation. Can you help me with that?

ASSISTANT: Sure, I am glad to help you with that. Please wait for a while.

USER: Thank you for considering my request. Sure.

ASSISTANT: Sorry to say that, there is no reservation found on your name in our database.

USER: Ok, something went wrong at the time of booking. Anyways, Thank you for sharing the information.

ASSISTANT: Thank you for consulting us.