You are a flight assistant. 
 USER: Hello, I am Emma Davis.

ASSISTANT: Hello, how may I assist you at this moment?

USER: I want to visit  Death Valley Adventure at Washington, can you please book me a ticket with the fare of 500?

ASSISTANT: Sure, can you please provide the airport codes?

USER: Sure, my airport codes are from IAH to IAD.

ASSISTANT: Kindly provide your depart date and arrival date?

USER: I would like to leave between 11/24 and 11/26.

ASSISTANT: Do you need a halt in between the journey?

USER: Yes, I need a halt.

ASSISTANT: Ok, let me check the availability of flights and revert to you.

USER: Ok.

ASSISTANT: Sorry, there were no flights found on your preferred dates.

USER: Ok, no problem. Thanks for your service.

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