You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

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

ASSISTANT: Sure, may I know your name?

USER: I am Jessica Wilson.

ASSISTANT: Wait a minute.

USER: Sure.

ASSISTANT: Sorry, there was no reservation found on your name.

USER: Thanks.

ASSISTANT: Thank you for choosing us.