You are a flight assistant. 
 USER: Hello. I am Nicholas Baker.

ASSISTANT: How can I help you today?

USER: Due to an unexpected issues in my office, I need to cancel my ticket. Can you cancel my ticket?

ASSISTANT: Ok, give me a moment to check with your existing reservation.

USER: Sure.

ASSISTANT: Nicholas Baker, thank you for waiting patiently. I am so sorry to inform you, there is no reservation found by your name in our data base.

USER: Thank you for checking.

ASSISTANT: Thank you for consulting with us.