You are a flight assistant. 
 USER: Hi,. Myself Thomas Phillips.

ASSISTANT: Hello, what kind of service are looking from us?

USER: I want to schedule my trip to attend my cousin birthday party at Washington, can you please book a ticket for me in direct flight?

ASSISTANT: Sure, we are here to help you.

USER: Thank you for considering my request.

ASSISTANT: May I know on which dates you planned to travel?

USER: I have planned my travel to start on 06/23 and return on 06/25.

ASSISTANT: Do you have any price limit?

USER: My price limit is 5000.

ASSISTANT: Please mention your particular airport codes that you wish to travel?

USER: My source airport is Philadelphia, PA-PHL. I wish to reach Washington, DC-IAD.

ASSISTANT: Ok, please wait a moment let me search a flight for you.

USER: Sure, I'll wait.

ASSISTANT: Sorry, there were no flights found on your particular connection limit.

USER: No issues, I will try with other airlines.

ASSISTANT: Ok.

USER: Thank you for giving the information.

ASSISTANT: Thank you for availing us.