You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello,.

USER: I am Samuel Wilson.

ASSISTANT: How can I render you?

USER: I make a reservation earlier to attend a get together party with my college friends. Due to some issues in college it is postponed. Can you please  change my reservation?

ASSISTANT: Sure, please be on hold.

USER: Sure.

ASSISTANT: Sorry, there is no reservation exists with your specified name. Thanks for approaching us.

USER: Ok, no issue. Thank you.