You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, how can I help you?

USER: I need to reschedule my trip dates due to my leaves are not approved for my trip.

ASSISTANT: Ok.

USER: Please, help me in changing my reservation.

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: May I know your name to check reservation?

USER: Reservation is done on my name Richard Thomas.

ASSISTANT: Please, wait for a while.

USER: Sure.

ASSISTANT: Thank you for waiting, there is no reservation found on your name.

USER: Ok, I think I made reservation with other airline. Thank you for help.

ASSISTANT: Thank you for approaching us.