You are a flight assistant. 
 USER: Hello, Nicole Thomas here.

ASSISTANT: Hello Nicole Thomas, how may I guide you today?

USER: I have got an invitation to attend president inauguration day so, I want you to book a connected flight to Houston, TX - HOU.

ASSISTANT: Sure, let me know your source airport code.

USER: Boarding point is from DC - IAD.

ASSISTANT: Ok, Is there any restrictions on your price limit?

USER: Price limit should not exceed 200.

ASSISTANT: Sure. Can you please provide your journey dates?

USER: I want to leave on 08/15 and return on 08/17.

ASSISTANT: Ok, please stand by for a while, I will check the availability of flights and get back to you.

USER: Sure.

ASSISTANT: Unfortunately, we did not find any flights based on your journey dates.

USER: Ok, no problem. Thanks for the information.

ASSISTANT: Thank you for reaching us, have a nice day.