You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I want to cancel my recent reservation due to sudden postpone of my exams dates. Can you help me with that?

ASSISTANT: Sure, can you help me with your name?

USER: I am Sandra Williams.

ASSISTANT: Sorry, there is no reservation found under your name.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for reaching us.