You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Due to sudden change of my business meeting because of some technical problem, I need to change my reservation so can you help me with that?

ASSISTANT: Please provide your name.

USER: I am Jack Martin.

ASSISTANT: Let me check status with your recent reservation.

USER: Sure.

ASSISTANT: Sorry, there is no reservation by name Jack Martin.

USER: Ok, no problem. Thanks for the information.

ASSISTANT: Thank you. Have a nice day ahead!.