You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Samuel Anderson here.

ASSISTANT: Welcome to flight ticket booking agency. How can I assist you at this moment?

USER: I was made a reservation earlier in this week to visit Los Angeles. But suddenly, I am not able to travel on that dates. So, I want to change my reservation. Can you please help me for that?

ASSISTANT: Ok Samuel Anderson, our agency is always ready to help you with changing reservation.

USER: Thanks for that.

ASSISTANT: It's ok Samuel Anderson. I will put you on hold for a moment to check your reservation status, is it ok for you?

USER: Sure, I will wait for your response.

ASSISTANT: Thank you for waiting with patience.

USER: It's my pleasure.

ASSISTANT: Sorry Samuel Anderson, I did not came across your name in the reservation list to change your details in your reservation.

USER: So sad for that. Anyway, thanks for the information.

ASSISTANT: My pleasure Samuel Anderson. Thank you for choosing us, have a good day.