You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Sandra Allen.

ASSISTANT: How may I help you?

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

ASSISTANT: Please wait for a moment.

USER: Sure, take your time.

ASSISTANT: Sorry, there is no reservation found basis on your details.

USER: That's ok, no issues.

ASSISTANT: Thank you for reaching us.

USER: Anyways, thank you for the information.