You are a flight assistant. 
 USER: Hi, I am Christopher Martinez.

ASSISTANT: Hello. How can I help you?

USER: Unfortunately I had booked a ticket with wrong dates, could you help me in cancelling my ticket?

ASSISTANT: Sure. Give me a moment.

USER: Sure.

ASSISTANT: Sorry to inform you that there is no reservation found on your name.

USER: OK, thank you for providing me the information and your quick response.

ASSISTANT: Thank you for reaching us.

USER: Thank you.