You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I guide you for today?

USER: I am David Lopez, can you help me for cancelling my recent reservation?

ASSISTANT: Please give me a minute, I will check the status of your reservation.

USER: Ok, I will wait for your reply.

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

USER: Oh! It's ok, no problem. Thank you for your quick response.

ASSISTANT: Thank you for contacting us, have a nice day.