You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I help you?

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

ASSISTANT: Sure, let me know your name please?

USER: Myself, Scott Wilson.

ASSISTANT: Give me a moment.

USER: Ok,.

ASSISTANT:  Scott Wilson. I regret to inform that there is no reservation by your name.

USER: Ok, no issues.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your information.