You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Robert Lewis here.

ASSISTANT: How can I help you today?

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

ASSISTANT: Sure, I am very happy to help you with that.

USER: Thank you for considering my request.

ASSISTANT: Please wait for a while.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry, no reservation is found on your name in our database.

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

ASSISTANT: Thank you for reaching us.

USER: Thank you for your service.