You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I guide you for today?

USER: Can you please help me in changing my existing reservation, as my exam got postponed.

ASSISTANT: Sure, I will help you about that. Can you please provide your name for checking the reservation status under your name?

USER: Myself, Matthew Nelson.

ASSISTANT: Please wait for some time to check the reservation status.

USER: Ok.

ASSISTANT: Sorry for the trouble which is caused to you, I have not found any reservation on your name in our database.

USER: Ok, no issues. Thank you for your information.

ASSISTANT: You are welcome, thank you for reaching us.