You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you today?

USER: As I have planned a holiday trip with my friends but, suddenly I need to attend a client meeting at head quarters, so I need to change my reservation. Can you please be my helping hand in changing my reservation?

ASSISTANT: Sure, may I know your name to check the reservation on your name?

USER: The reservation has been done with name of Justin Nelson.

ASSISTANT: Please wait for a couple of moments, I will check and revert to you.

USER: Ok.

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

USER: Ok, no problem. Thank you for the information.

ASSISTANT: Thank you for contacting us.