You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, what can I do for you?

USER: Due to medical emergency, I want to cancel my recent reservation. Can you aid me with this?

ASSISTANT: Please, provide your name.

USER: My name is Jack Nelson.

ASSISTANT: Please wait.

USER: Sure.

ASSISTANT: Sorry, there is no reservation found.

USER: Ok, thank you.

ASSISTANT: Thanks for choosing us.