You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Gregory Walker.

ASSISTANT: How can I aid you today?

USER: Due to typical climatic conditions in my visiting place, I would like to cancel my recent reservation. Will you help me with this?

ASSISTANT: Sure, I am happy to help you with that.

USER: Thank you.

ASSISTANT: Sorry to say this,there is no reservation found under your name in our database.

USER: Ok, not an issue. Thank you for providing information.

ASSISTANT: Thank you for reaching us.