You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Mark Nelson here.

ASSISTANT: How can I help you?

USER: Due to emergency, I want to cancel my reservation. Can you please help me for that?

ASSISTANT: Please wait.

USER: Ok, I will wait.

ASSISTANT: Sorry, no reservation found.

USER: Anyway, thanks for the information.

ASSISTANT: Thank you for reaching us.