You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: Could you please change my existing reservation due to postpone of my exams?

ASSISTANT: Please share your name to proceed further.

USER: My name is Shirley Lewis.

ASSISTANT: Shirley Lewis sorry, no reservation found as per your preferences.

USER: No problem, thank you for checking.

ASSISTANT: Thank you for choosing us.