You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

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

ASSISTANT: Please wait a while.

USER: Sure, take your time.

ASSISTANT: Sorry to say, there is no reservation on your name in our database.

USER: That's ok, not an issue. Anyways, thank you for the information.

ASSISTANT: Thank you for opting us.