You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how best can I aid you for the day?

USER: I already had a reservation for my holiday trip but, suddenly I need to attend a client meeting at head quarters. So I need to change my reservation. Can you please modify my reservation?

ASSISTANT: Sure, I will be your helping hand in modifying your reservation.

USER: Thank you.

ASSISTANT: May I know on which name the ticket has been reserved?

USER: Ticket has been reserved on the name of Emma Perez.

ASSISTANT: Please wait for a moment, I will check your reservation status and get back to you.

USER: Sure, I will wait for your response.

ASSISTANT: Thanks for waiting. Sorry to say that there is no reservation found on the name of Emma Perez.

USER: Ok, no issues. Thank you for giving the information.

ASSISTANT: Thank you for choosing us, hope to serve you again.