You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, do you need any help from us?

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

ASSISTANT: Ok, could I have your name please?

USER: Sure, my name is Melissa Miller.

ASSISTANT: Ok, please allow me a moment.

USER: Sure, take it.

ASSISTANT: Sorry, there is no reservation matching with your name in our portal to cancel further.

USER: Ok, not an issue. Anyways, thank you for your service.

ASSISTANT: You are welcome, have a great day.