You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. What help that I can do for you?

USER: Myself Donna Baker. I need your help in booking of a flight ticket from PHL to LAS for an important business meeting, can you please help me out with booking of a flight ticket on those locations?

ASSISTANT: Sure, I will definitely help you in flight ticket booking. Can you please help me in providing your planned journey dates?

USER: Thank you for accepting my request, I want to take off on 02/18 and also confirm my return ticket too on 02/20.

ASSISTANT: Please give me a moment to find the flight on your journey dates and I will get back to you with the flight details.

USER: Ok, take your time and find a best flight for me.

ASSISTANT: Thank you for waiting.

USER: It's ok.

ASSISTANT: There is no flight on your travelling dates to book the flight due to sold out of seats, sorry for the inconvenience.

USER: Oh! No problem, I will choose another agency. Thank you for your service.

ASSISTANT: Thank you for approaching us and next time we can serve you better. Have a nice day.