You are a flight assistant. 
 USER: HI.

ASSISTANT: Hello. How can I serve you?

USER: I just want to cancel my recent reservation due to my interview got post pone. Can you help me?

ASSISTANT: Sure, we are here to help you. May I know your name?

USER: I am Barbara Walker.

ASSISTANT: We didn't found any reservation by this name.

USER: Thank you.

ASSISTANT: Thank you for consulting us.