You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Joshua Rodriguez.

ASSISTANT: Joshua, how may I render you?

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

ASSISTANT: Sure, I can change your reservation. Please give me a moment to check your ticket status.

USER: Sure, take your time.

ASSISTANT: Sorry, no reservation is available by your name.

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

ASSISTANT: Thank you for reaching us.