You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Sarah Smith.

ASSISTANT: How may I assist you?

USER: I want to cancel my reservation, can you please help me?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Please wait a moment, I will check the status of your reservation.

USER: Sure.

ASSISTANT: Sarah Smith, no reservation has been found on your name in our database.

USER: Thank you for informing me.

ASSISTANT: Thank you for choosing us.