You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Earlier I made a reservation for my trip through an agent but, agent booked on wrong date. So, I request you to please change it to my actual date.

ASSISTANT: Sure, I am glad to help you.

USER: Thank you.

ASSISTANT: Please let me know your name to check the existing reservation in our database.

USER: Sure, my name is Michael Brown.

ASSISTANT: Ok, please hold on a moment.

USER: Sure.

ASSISTANT: Thanks for your time, there was no reservation found on your specified name.

USER: Ok, that's not a problem. Leave it. Anyhow thanks for your quick response.

ASSISTANT: Thank you for reaching our travelling service.