You are a flight assistant. 
 USER: Hello.

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

USER: I am looking to cancel my flight ticket because I got a call from my parent that they are coming to Oakland to meet me. So, I have cancelled my trip. Can you please help me to cancel the ticket?

ASSISTANT: Sure, I am glad to help you.

USER: Thank you for considering my request.

ASSISTANT: Could I have your name please?

USER: My name is Samantha Walker.

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

USER: Oh! Not a problem with that. Anyways, thank you for checking my ticket status.

ASSISTANT: You are welcome.