You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you today?

USER: I want to change my existing reservation due to postpone of meeting with my lawyer. Can you assist me in this?

ASSISTANT: Sure, I'll help you in change an existing reservation.

USER: Thanks.

ASSISTANT: Please let me know your name to check the reservation status.

USER: Sure, my name is Emily Jones.

ASSISTANT: Ok, please wait a moment.

USER: OK.

ASSISTANT: Thank you for waiting, we did not found any reservation by this name.

USER: Ok, no problem.

ASSISTANT: Thank you for availing us.

USER: Thanks for the information.