You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I am Karen Thomas. My interview has postponed, so I want to change my existing reservation.

ASSISTANT: Nice to meet you Karen.

USER: Can you please help me?

ASSISTANT: Sure, I will help you with that. Please give me a moment.

USER: Sure.

ASSISTANT: Thank you for your patience. Sorry Karen, there is no reservation has found under your name.

USER: That's fine. Thank you for your time.

ASSISTANT: Thank you for reaching us.