You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. What type of help you are expecting from our side?

USER: I have planned a trip to enjoy my holidays in AUS, but on the same day there is an occasion on my friends engagement, so I want to change postpone my trip to other dates, can you please help me in modifying my flight ticket?

ASSISTANT: Yes, I am happy to help you.

USER: Thank you.

ASSISTANT: Can you please let me know your name?

USER: Sure, I am Samuel Walker.

ASSISTANT: Ok, please give me a couple of seconds to check.

USER: Sure, take your own time.

ASSISTANT: I am really sorry for the trouble which is caused to you, I didn't found any reservation regarding your name in our database.

USER: Ok, not an issue. Thank you for your time.

ASSISTANT: You are welcome. Thank you for reaching our travel agency.