You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you?

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

ASSISTANT: Ok, please can you let me know your name to proceed?

USER: My name is Amanda Adams.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Ok, thank you for waiting. Sorry, there is no reservation been found on your name to amend.

USER: Thank you.

ASSISTANT: Ok, thank you for choosing our agency.