You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you for  the day?

USER: My scheduled examination dates has been postponed, could you please help me with changing my recent reservation?

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

USER: My reservation was done under the name David Lopez.

ASSISTANT: Ok, please be on hold.

USER: Sure, take your time.

ASSISTANT: Sorry we did not find any reservation on your name.

USER: Ok, not an issue. Anyways, thank you for the information.

ASSISTANT: Thank you for choosing us.