You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I want to change my reservation, due to some problems I am not travel those dates, can you please change my travel dates?

ASSISTANT: Sure, please mention the name for checking the reservation.

USER: Sure, my name is Frank Gonzalez.

ASSISTANT: Please give me a moment.

USER: Ok.

ASSISTANT: Thank you for waiting, there is no reservation found under your name.

USER: Oh! It's ok no problem. Thank you for your information.

ASSISTANT: Welcome, have a great day.