You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Justin Wright.

ASSISTANT: How can I help you?

USER: I would like to have a reservation to Washington for my architectural project and study old buildings.

ASSISTANT: That's great to hear. Will you provide your airport codes?

USER: So, I need a reservation from DCA to IAD.

ASSISTANT: Please provide your travelling dates.

USER: My journey dates are 01/27 to 01/29.

ASSISTANT: Unfortunately there is no flights found under your required details.

USER: Ok, no problem. Thanks for checking.

ASSISTANT: Welcome, have a great day.