You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Mark Miller on this end.

ASSISTANT: What kind of assistance you are expecting from our agency?

USER: I live in Minneapolis for my office work and I have planned to visit my hometown for this weekend, but I want to change my reservation due to office meeting. Can you help me out?

ASSISTANT: Sure, I am glad to help you. Please allow me to check your previous reservation status.

USER: Thank you for your positive response, I will be waiting for your reply.

ASSISTANT: I appreciate your patience, please be online for a moment.

USER: No issues with it, take your time to check.

ASSISTANT: Mark, there is no active reservation has been found on your name in our database.

USER: I am sure that I have reserved a ticket with your airlines, can you please recheck for my existing reservation?

ASSISTANT: I have rechecked your reservation but I could not find any active booking in our database.

USER: Oh! That's very sad to hear from your side. Anyways, thank you for checking.

ASSISTANT: Do you need any other assistance from our agency?

USER: No, thank you for asking. I appreciate your services and quick response.

ASSISTANT: Thank you for reaching us. Hope you visit us again and recommend your friends to choose our agency.

USER: Sure, thank you for your humble assistance. Welcome.