You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

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

ASSISTANT: Ok, please provide your name to check your reservation.

USER: My reservation was done under the name Helen Green.

ASSISTANT: Thanks for your response, wait for a while.

USER: Sure, take your time.

ASSISTANT: There is no reservation found with your name to change it.

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

ASSISTANT: Thank you for choosing us.