You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I render you today?

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. Let me know your name to check your reservation?

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

ASSISTANT: Ok, please wait a moment.

USER: Sure, take your time.

ASSISTANT: Thank you for waiting. I have checked in reservation list to change your ticket, but could not find any reservation with your name.

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

ASSISTANT: Thank you for reaching us.