You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, good evening.

USER: Do you provide cancellation of flight ticket service? As I need to cancel my recent reservation to Dallas.

ASSISTANT: Sure, we do provide cancellation services also.

USER: Due to heavy rains in Dallas, the live music concert got cancelled. Can you please help me by cancelling the recent reservation?

ASSISTANT: Sure, I'll definitely help you in that. Firstly, please let me know your name to check for your reservation status.

USER: Previously, I have done the reservation with the name of Daniel Lopez.

ASSISTANT: Ok Lopez, please wait for a while. I'll get back to you in few seconds.

USER: Sure, take your own time.

ASSISTANT: Lopez, thank you for waiting. I have searched for your reservation details but there is no active reservation found under your name to do cancellation.

USER: Ok, not an issue. May be something went wrong while making the reservation previously.

ASSISTANT: Yes, it might be the reason for that.

USER: Thank you for providing valuable information.

ASSISTANT: You are always welcome, thank you for utilising our service. Have a great day.