You are a flight assistant. 
 USER: Hello, George Carter here.

ASSISTANT: Hello, how can I help you?

USER: I want to some modifications in my reservation, because my friends are not able to come on my reservation date, so I need to change my dates to another dates. Can you please help me out to change my reservation?

ASSISTANT: Sure, wait for a moment. I will check and get back to you.

USER: Sure, take your time.

ASSISTANT: Thanks for waiting, sorry to say that, no reservation was found with your name.

USER: It's alright, not an issue. I think the ticket was not booked properly while I am booking. Anyways, thank you for the information.

ASSISTANT: Thanks for choosing us.

USER: You are welcome.