You are a flight assistant. 
 USER: Hello. I am Emma Hall.

ASSISTANT: Hello, how may I assist you today?

USER: I want to cancel my reservation due to sudden postpone of my interview. Can you help me?

ASSISTANT: Sure, please wait for a moment.

USER: Sure.

ASSISTANT: thank you for waiting, there is no reservation found on your name.

USER: Ok, not a problem. Thank you.

ASSISTANT: Thank you for contacting us.