You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Alexander Evans.

ASSISTANT: How may I assist you today?

USER: Can you help me in cancelling my recent reservation, as my exam is postponed?

ASSISTANT: Sure, I will help you. Please wait a moment.

USER: Ok.

ASSISTANT: Sorry there is no reservation on your details.

USER: No issue, thank you.

ASSISTANT: Thank you.