You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I be your helping hand?

USER:  I am Lisa Davis want to cancel my reservation owing an emergency.

ASSISTANT: Ok, please give me a moment.

USER:  Ok.

ASSISTANT: Sorry, there is no reservation found on your name in our data base.

USER:  Thank you for your good response.

ASSISTANT: Thank you for contacting us.