You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: My planned trip got cancelled unexpectedly, so I need to cancel my ticket. Could you please help me?

ASSISTANT: Sure, may I know your name to check for the previous reservation?

USER: My name in previous ticket is Alexander Allen.

ASSISTANT: Please allow me a moment to check for the previous reservation.

USER: Sure, I will wait for your response.

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

USER: That's fine, thank you for checking.

ASSISTANT: Thank you for contacting us.