You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I want to cancel my ticket which is booked in the last week because I am unable to travel. Can you help me?

ASSISTANT: Sure, I will help you. May I know your name?

USER: I am John Walker.

ASSISTANT: There is no reservation with your name.

USER: It's ok, not an issue.

ASSISTANT: Thank you to approach us.

USER: Welcome.