You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you at this moment?

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

ASSISTANT: Sure, I will help you with that. Can you please mention your name for further process?

USER: My reservation was done under the name Ryan Walker.

ASSISTANT: Ok, please hold on a moment.

USER: Sure, take your time.

ASSISTANT: There is no previous reservation available under your name.

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

ASSISTANT: Thank you for reaching us.