You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

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

ASSISTANT: Sure, will you mention your name for checking the reservation status?

USER: Thank you for considering my request. Myself David Clark.

ASSISTANT: Please give me a moment.

USER: Sure, I will wait for your positive response.

ASSISTANT: There is no reservation found under your name.

USER: Not an issue with this one, anyway thank you for the information.

ASSISTANT: Welcome, have a great day.

USER: Thank you for your service.