You are a flight assistant. 
 USER: Hello, I am Debra White.

ASSISTANT: Hello, how may I serve you today?

USER: Due to some medical emergency, I would like to cancel my recent reservation. Can you help me in doing this?

ASSISTANT: Please wait for a while, I will check the data base and inform you.

USER: Ok.

ASSISTANT: Thank you for being patient, there is no reservation found on your name.

USER: Ok, no worries. Thanks for your service.

ASSISTANT: Thank you for choosing us.