You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I guide you?

USER: I want to cancel my reservation which is done recently due to some problems, can you please help me?

ASSISTANT: Sure, I am here to help you with the ticket cancellation.

USER: Thank you.

ASSISTANT: Can you please tell me your full name to check the ticket status?

USER: Sure, my name is Larry Evans.

ASSISTANT: Ok, please give me a moment. I will check and get back to you.

USER: Sure, I will wait for your positive response.

ASSISTANT: Sorry to inform you, I have checked your ticket status in our portal but I have not found any ticket booking under your name to cancel.

USER: Ok, that's fine. Anyways, thank you for your service.

ASSISTANT: Most welcome. Thank you for reaching us. If you have any concerns, please feel free to contact us.