You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you now?

USER: I need to change my reservation due to my planned event got postponed. So please  help me with changing my reservation.

ASSISTANT: Sure, may I know your good name to check the reservation list?

USER: Thank you. Please check the reservation with my name Emma King.

ASSISTANT: Please wait a moment I will search the reservation states.

USER: Sure,  I will wait.

ASSISTANT: Sorry Emma King, unfortunately there is no active reservation on your name.

USER: Oh! I will check my mail once again for the confirmation of my ticket booking. Anyway, thank you for your time.

ASSISTANT: Thank you for communicating us, have a nice day.

USER: Most welcome.