You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am John Martin.

ASSISTANT: How can I assist you today?

USER: I am unable to travel at this moment because I have some work in my hometown, so can you help me cancelling my recent reservation?

ASSISTANT: Sure, I will help you on that.

USER: Thank you.

ASSISTANT: Please give me a moment.

USER: Ok, I will wait for your reply.

ASSISTANT: There is no reservation found under your name.

USER: Oh! I think my sister's already cancelled my reservation, anyway thank you for your quick response.

ASSISTANT: Welcome, have a great day.