You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Steven Hall.

ASSISTANT: How can I assist you today?

USER: I am planning to change an existing reservation, due to some urgent work. Can you please change my reservation?

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

USER: Sure, take your own time.

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

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

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