You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello,. On what purpose, you have visited here?

USER: I am suddenly fallen sick due to bad weather so, I want to cancel my recent reservation. Can you help me with that?

ASSISTANT:  Sure, I will help you in that.

USER: Thank you.

ASSISTANT: To cancel your ticket, we need your name. Can you provide it?

USER: Sure, my name is Melissa Nelson.

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: Sorry Melissa, there is no reservation found on your name to cancel it.

USER: Ok, that's not a problem. Thanks for your quick response.

ASSISTANT: Thanks for approaching us.