You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you today?

USER: Owing to an emergency, I want to change my existing reservation.

ASSISTANT: Sure, I am glad to help you in changing. Please, share me your name to check your reservation.

USER: Sure, Amanda Clark here.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Sorry, we have not found any active reservation on your name in our database.

USER: Ok, no issues. Thank you for your information.

ASSISTANT: Thank you for reaching us.