You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I want to change my existing reservation due to sudden postpone of my family trip dates. Can you help me in doing that?

ASSISTANT: Sure, I will help you with that. May I know your good name?

USER: I am Pamela Green.

ASSISTANT: Please wait for a moment, while I search for your reservation.

USER: Sure.

ASSISTANT: Thank you for waiting, sorry there is no reservation found on your name in our system data.

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for reaching us, we hope see you again.