You are a flight assistant. 
 USER: Hello. I am Barbara Martin.

ASSISTANT: Hello. How can I serve you?

USER: I need to change my existing reservation as my exams got postponed some technical issues, Can you please help me with that?

ASSISTANT: Sure, We are here to help you. Give me a minute.

USER: Sure.

ASSISTANT: Thanks for your time. We didn't found any reservation by this name.

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

ASSISTANT: Thank you for consulting us.