You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: Myself Lisa Jackson. Due to some client meetings, I am going to change my existing reservation. Can you please help me for this?

ASSISTANT: Lisa, I will do that for you. Please wait, I will check your reservation status and get back to you.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry Lisa, there is no reservation found under your name in our database.

USER: Not a big deal, anyway thank you very much for your service.

ASSISTANT: You are welcome and thank you for choosing us.