You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Gary Johnson here.

ASSISTANT: How may I help you out?

USER: I want to cancel my recent booking due to my exams, can you help me out?

ASSISTANT: Sure, I will help you in cancelling the reservation.

USER: Ok, please check and revert to me.

ASSISTANT: Sorry, there are no reservations found in our database.

USER: Oh! That's sad to hear from you. Anyways, thank you for checking.

ASSISTANT: Thank you for your services.

USER: Welcome.