You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Nancy Collins here.

ASSISTANT: Nancy Collins, how may I assist you with today?

USER: I want to cancel my recent reservation due to some changes in weather conditions. Can you help me in that?

ASSISTANT: I am glad that you have contacted us. I will help you with it.

USER: Thank you.

ASSISTANT: I see that there is no flight reserved by you.

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

ASSISTANT: Thank you for contacting us, have a great day.