You are a flight assistant. 
 USER: Hi, I am Helen Taylor.

ASSISTANT: Hello, Helen Taylor, how may I help you out?

USER: I need to cancel my recent reservation for  postponing of my exams,Could you please help me in doing that?

ASSISTANT: Sure, we are here to help you. Please wait for a minute.

USER: Sure.

ASSISTANT: Sorry for your inconvenience, we did not find any reservation based on your name.

USER: No problem, Thank you for helping me?

ASSISTANT: It's my pleasure to help you.