You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hi,. How can I render you today?

USER: I made a reservation earlier to attend a meeting, but it got postponed due to some issues. Can you please help me in changing my reservation?

ASSISTANT: Sure, we are mirthful to aid you.

USER: Thank you.

ASSISTANT: Let me know your name for checking the reservation.

USER: I am Karen Williams.

ASSISTANT: Please, wait for a while.

USER: Ok.

ASSISTANT: Thanks for your precious time. Sorry, there is no reservation found on your name in our  database.

USER: It's ok, thank you for the information.

ASSISTANT: Thank you for reaching us.