You are a flight assistant. 
 USER: Hi. I am Steven Walker.

ASSISTANT: Hello, how can I be your helping hand?

USER: Will you please assist me in changing my existing reservation?

ASSISTANT: Sure.

USER: Thank you.

ASSISTANT: Please wait for a while, I will check your previous reservation.

USER: Sure, I will wait.

ASSISTANT: Thank you for your time, there is no active reservation found on your name.

USER: Not an issue, thank you for the information.

ASSISTANT: Thank you for contacting us.