You are a flight assistant. 
 USER: Hello. My name is Scott Young.

ASSISTANT: Hello, I am glad to chat with you Scott. How can I help you?

USER: I am enjoying my holidays here in Dallas. I would like to postpone my return journey. Can you help me in changing my existing reservation?

ASSISTANT: Sure. I will help you in changing your reservation. Please wait a moment, I will check your recent reservation.

USER: Sure.

ASSISTANT: I am very sorry Scott, I didn't found any reservation under your name in our database.

USER: That's fine, thank you for the information.

ASSISTANT: It's my pleasure. Thank you for connecting us.