You are a flight assistant. 
 USER: Hi, I am Justin Martin.

ASSISTANT: Hello, How can I help you?

USER: I need to travel to Washington IAD to enjoy twilight tour with my colleagues. Can you make a direct flight reservation?

ASSISTANT: Sure, let me know your travel dates?

USER: Sure, I need to fly on 04/04 and 04/06.

ASSISTANT: Kindly mention your source airport code?

USER: Sure, I would like to deviate from Chicago ORD.

ASSISTANT: Ok, wait for a minute.

USER: Sure.

ASSISTANT: Thanks for your time, no flights are available with your given requirements.

USER: Ok, not an issue. Thank you for your help.

ASSISTANT: Thanks for opting us.