You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I best assist you now?

USER: Due to some urgent meeting, I am planning to change my existing reservation. Can you please help me for this?

ASSISTANT: Sure, I can change your reservation right now. Before that I need to know your good name please?

USER: Myself Rebecca Carter.

ASSISTANT: Ok, wait for some time I will check the reservation on your name and get back to you.

USER: Sure, I will wait for your response.

ASSISTANT: We are sorry to say that, there is no active reservation found on your name.

USER: Not a big deal, anyhow thank you very much for checking the reservation status.

ASSISTANT: Thanks for approaching us, wish you a great day.