You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, welcome to flight booking agency. How may I help you today?

USER: Due to heavy cyclones in the Dallas, I would like to cancel my recent reservation to Dallas.

ASSISTANT: Ok, may I know your name to check your reservation is existing or not?

USER: I have previously reserved my ticket with the name of Charles Hall.

ASSISTANT: There is no reservation found under your name, Charles.

USER: Ok, no issues. May be I have done the mistake during my previous reservation.

ASSISTANT: May be, sometimes it happens.

USER: Thank you for providing information.

ASSISTANT: Welcome, thank you for choosing us.