You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you?

USER: I would like to cancel my flight reservation as I am sick, please help me.

ASSISTANT: Ok, please mention the name on which you have reserved your reservation to check?

USER: Thank you. I am David Collins.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Thank you for waiting, sorry as per the reservation records you ticket is not found to cancel.

USER: Not an issue. Thank you for checking.

ASSISTANT: Thank you for choosing our agency.