You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how may I aid you?

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

ASSISTANT: Sure, I am here to help you for this. May I know your name please?

USER: I am Joseph Perez.

ASSISTANT: Just a moment, let me check your reservation status in our records.

USER: Ok.

ASSISTANT: Sorry for inconvenience, no reservation is found under your name.

USER: Ok, no issues.

ASSISTANT: Thank you very much for contacting our agency.

USER: Thank you for your information.

ASSISTANT: You are most welcome.