You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Karen Davis.

ASSISTANT: How may I assist you today?

USER: I want to cancel my reservation because of my exams were postponed. Can you check with it?

ASSISTANT: Sure, please wait for a minute.

USER: Sure.

ASSISTANT: I cancelled your reservation successfully.

USER: Thanks for helping me.

ASSISTANT: Thank you very much for contacting us.