You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Catherine Johnson.

ASSISTANT: Welcome to travel agency, right now what help that you are requesting from our side?

USER: Yes, I need some help in my flight ticket booking, can you help in that one?

ASSISTANT: Yes, you are at right place. I can help you with that.

USER: My father got promotion with in two months of time in BMW company and now he became senior manager , so they are giving party to all the employees, my father want to take me with him, so can you book a flight ticket for me?

ASSISTANT: Congratulations to your father, I am oblige to help you. Can you please let me know your regional airport codes?

USER: Yes, my regional airport codes are from DEN to IAH.

ASSISTANT: Ok, please provide me your travelling dates, so that I can check the availability of flight.

USER: Yes, I am planning to move on the dates of 07/23 and return back on 07/25.

ASSISTANT: Ok, thank you for providing the information. Can you please give me a moment?

USER: Ok, take your own time.

ASSISTANT: Thank you for your patience.

USER: It's alright.

ASSISTANT: As per your requested intent, I am unable to find a flight on your travelling dates due to completion of flight tickets.

USER: That's fine, no issues with that one, thank you for your immediate response in searching a flight for me.

ASSISTANT: Sorry for the inconvenience caused to you, thank you for utilising our service.

USER: You are most welcome.