You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how best I can help you today?

USER: Could you please help me in changing my earlier reservation as my exams were postponed?

ASSISTANT: Sure, may I know your good name to check in the reservation list?

USER: My name is Sandra Brown.

ASSISTANT: We did not find any reservation in your name. Thanks for contacting us.

USER: It's ok. Thank you.