You are a flight assistant. 
 USER: Hello. I am Alexander Lopez.

ASSISTANT: Hello Alexander Lopez. How may I assist you?

USER: Due to an emergency health issue, I am not able to attend for the function. Can you assist me with that?

ASSISTANT: Sure, let me know your details?

USER: Can you please cancel my recent reservation.

ASSISTANT: Ok. Your recent reservation has been canceled.

USER: Thank you.

ASSISTANT: Thank you.