You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I hand helping to you?

USER: I'm Barbara Martinez. I am planning to attend convocation meeting at Philadelphia, can you please help me with booking a flight ticket?

ASSISTANT: Nice to meet you Martinez. Yes, I can help you. Can you please help me in providing your trip dates?

USER: Sure, I would like to take off on 01/25 and return back on 01/27.

ASSISTANT: Ok, may I know the nearest airport location codes?

USER: My source airport code is LAS and the destination airport code is PHL.

ASSISTANT: Please give me a moment.

USER: Ok, but please make sure that the connection limit is 1.

ASSISTANT: Thank you for being on hold.

USER: You are welcome.

ASSISTANT: I am unable to find a flight on the dates which you have provided to book your flight ticket. Sorry for the inconvenience.

USER: Ok, no issue. Thank you for checking.

ASSISTANT: You are most welcome and have a nice day.