You are a flight assistant. 
 USER: Hi, I am Brian Gonzalez.

ASSISTANT: Hello, how can I assist you at present?

USER: I need to book a direct flight from Washington, so please help me in booking a flight to ORD.

ASSISTANT: Sure, please mention your source airport code.

USER: My source airport code is DCA.

ASSISTANT: Ok, when do you want to travel?

USER: My planned dates are on June 11th to 13th.

ASSISTANT: Ok, Do you have any class preference?

USER: No, I am okay with any class.

ASSISTANT: Ok, Do you have any specific preferences regarding timings of your journey?

USER: Yes, my depart is in morning time.

ASSISTANT: Ok, Do you have any other preferences?

USER: No.

ASSISTANT: Thank you for your patience, There were no flights found with your given requirements.

USER: Not a problem, thank you.

ASSISTANT: Thank you for reaching us.