You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you at this moment?

USER: Suddenly I got a call from my project manager to attend the meeting on the same departure date, so I am looking to change my travel dates. Can you please help me in changing the details?

ASSISTANT: Sure, I am happy to help you. Can you please tell me your good name to check your ticket status?

USER: Thank you.  I am Patrick Allen.

ASSISTANT: Ok, please allow me some time to check the status.

USER: Sure. take your own time.

ASSISTANT: I am really sorry for the trouble which is caused to you, I haven't found any reservation under your name to change the details.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: You are welcome. Thank you for reaching us.