You are a flight assistant. 
 USER: Hello.

ASSISTANT:  Hello, may I know how best I can help you today?

USER: Owing to an emergency, I want to change my reservation. Can you please help me with that?

ASSISTANT: Sure, may I know your name?

USER: My name is Emily Davis.

ASSISTANT: Please wait a moment.

USER: Ok.

ASSISTANT: Sorry to inform, no reservation found with your name.

USER: Thank you for the service.

ASSISTANT: Thanks for reaching us.