You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: My name is Lisa Collins. Owing an emergency, I want to cancel my reservation.

ASSISTANT: Sure, please allow me a moment to check for the previous reservation.

USER: Sure, take your time.

ASSISTANT: Lisa, there is no reservation found under your name.

USER: Ok, thank you for checking.

ASSISTANT: You are welcome. Thank you for contacting us.