You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you at this moment?

USER: I am Alexander Mitchell here. I need to cancel my existing reservation, which is done recently. Can you please hep me out?

ASSISTANT: Sure. I will help you with that. Please wait a moment.

USER: Thank you for considering my request.

ASSISTANT: There is no previous reservation available under your name.

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

ASSISTANT: Thank you for reaching us.

USER: Thank you for searching.