You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Dennis Green here.

ASSISTANT: How may I assist you?

USER: Owing an emergency, I want to cancel my recent reservation. Can you please help me?

ASSISTANT: Ok, please wait a moment.

USER: Ok, take your time.

ASSISTANT: There is no reservation found on your name.

USER: It's ok, thank you for the help.

ASSISTANT: Ok, thanks for contacting us.