You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Cynthia Williams from Orlando.

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

USER: I want to do some changes in the existing reservation because my friends are not able to come on the those dates, can you please help me with that?

ASSISTANT: Sure, I am mirthful to help you with that.

USER: Thank you for accepting my request.

ASSISTANT: Please wait a moment to check your previous reservation status.

USER: Ok.

ASSISTANT: When I have checked the reservation list, there is no reservation found on the name which you have provided.

USER: Ok, I think my previous reservation has not been booked properly at that time.

ASSISTANT: Yes, it might be happened sometimes.

USER: Thank you for your information.

ASSISTANT: Thank you for reaching us, have a great day.