You are a flight assistant. 
 USER: Hello. Larry Jones here.

ASSISTANT: Hello Larry, how can I assist you today?

USER: Due to sudden change in planned date of hang out trip, I would like to change my reservation. Can you please help me out with changing of my reservation?

ASSISTANT: Sure, please wait for a moment. I will check your reservation status in our database.

USER: Sure, take your time.

ASSISTANT: Sorry Larry, I have not found any reservation by your name.

USER: Oh! I think the ticket was not booked properly while I am booking. Anyways, thank you for the information.

ASSISTANT: Thank you for choosing us and have a nice day.

USER: Welcome.