You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello,.

USER: I am Edward Fernandez.

ASSISTANT: How can I assist you today?

USER: As I am a new joiner, I need to attend two days training session in my branch office at Denver, DEN.

ASSISTANT: Ok.

USER: Can you please make  a reservation with direct flight?

ASSISTANT: Sure, we are perky to assist you. Provide me your origin code for booking further.

USER: Washington, DCA is my origin airport.

ASSISTANT: Help me with your dates of trip.

USER: My journey dates on 06/23 and 06/25.

ASSISTANT: Thanks for sharing the information. There is no flight found on search on your dates of travel.

USER: Ok, no issue. Thank you for your information.

ASSISTANT: Thank you for availing us.