You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Alexander Johnson here.

ASSISTANT: How may I help you out?

USER: Can you please help me with cancelling my previous booking? As, my physician suggested me to avoid travelling.

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

USER: Thank you.

ASSISTANT: Sorry, there are no reservations found.

USER: Oh! That's very sad to know form your side. Anyways, thank you for checking.

ASSISTANT: Thank you for reaching us.

USER: You are most welcome.