You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I want to change my existing reservation due to an emergency, can you please help me?

ASSISTANT: Sure, can I know your name?

USER: Sure, my name is Ashley Lee.

ASSISTANT: Sorry, there is no reservation found on given name.

USER: Ok, not an issue.Thank you for your information.

ASSISTANT: Thank you reaching us.