You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Emily Lewis here.

ASSISTANT: How can I assist you at this moment?

USER: I want to book a reservation for my journey to PHL to attend an art exhibition, can you help me?

ASSISTANT: Sure, I will help you with that.

USER: Thanks.

ASSISTANT: Can I have your travel dates please?

USER: I will be travelling on the dates from 12/25 to 12/27.

ASSISTANT: Ok, please let me know airport code of your source location.

USER: My source airport code is PHL, and my destination is IAD.

ASSISTANT: Please wait a moment and I will check for flight availability.

USER: Ok.

ASSISTANT: Sorry Emily Lewis, no flight is available to you on your dates.

USER: Oh! No issues with it, I will find any alternative to reach my destination.

ASSISTANT: Ok fine.

USER: Thank you for helping me.

ASSISTANT: Thank you for choosing us, have a great day.