You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Melissa Martin. I want to cancel my reservation.

ASSISTANT: How may I help you out? Sure, please wait a moment. I will help you in cancelling the reservation. Please wait a moment.

USER: Sure.

ASSISTANT: Sorry, there are no reservations found.

USER: That's ok. Thank you.

ASSISTANT: Thank you for choosing us.