You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Melissa Clark here.

ASSISTANT: How can I assist you today?

USER: Due to sudden health problem, I am not able to travel in a flight on those dates. Can you please help me out with cancelling of my reservation?

ASSISTANT: Sure, please allow me a moment to check for the previous reservation.

USER: Sure, take your time.

ASSISTANT: Melissa, there is no reservation found under your name.

USER: Oh! I think the ticket was not booked properly while I am booking. Anyway, thank you for the information.

ASSISTANT: Thank you for contacting us. Thank you for contacting us.