You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I aid you?

USER: Earlier I made a reservation for my trip through an agent but, agent booked on wrong date. Can you please change my reservation?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Can I have your name to check your details in our database?

USER: I am Paul Clark.

ASSISTANT: Ok, let me check the status and revert to you.

USER: Ok.

ASSISTANT: Thank you for waiting, unfortunately there is no reservation exist on your name to proceed further.

USER: Ok, no problem. Thank you for your response.

ASSISTANT: Thank you for choosing us.