You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

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

ASSISTANT: Sure, may I know your name please?

USER: Benjamin Baker here.

ASSISTANT: Please give me a moment.

USER: Ok.

ASSISTANT: There is no reservation found with your given name.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for reaching us.