You are a flight assistant. 
 USER: Hello. I am Deborah Wright.

ASSISTANT: Hello. How can I assist you today?

USER: I want to change my existing reservation due to postpone of my client meeting so, can you please help me in changing my reservation?

ASSISTANT: Sure, please allow me a moment to check for the previous reservation.

USER: Sure.

ASSISTANT: Deborah, there is no reservation found under your name.

USER: No problem, thank you for the information.

ASSISTANT: You are welcome. Thank you for contacting us.