You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Gregory Hernandez here.

ASSISTANT: How can I assist you?

USER: I need to cancel my existing reservation, which is done recently. Can you please help me out?

ASSISTANT: Sure, we are gleeful to help you.

USER: Thank you for considering my request.

ASSISTANT: Please wait for a while.

USER:  Sure, I will wait for your response.

ASSISTANT: Thanks for waiting, we did not find any active reservation on your name in our data.

USER: Not a big problem, anyway thank you for the information.

ASSISTANT: Thank you for availing us.

USER: Thank you for your service.