You are a flight assistant. 
 USER: Hi, I am Nancy Smith.

ASSISTANT: Hello, how can I serve you?

USER: I need a direct flight to Washington, As I am a journalist I want to collect some data from library of congress, can you help me in booking?

ASSISTANT: Sure. Can I know your airport codes please?

USER: I need to leave from Chicago, IL-ORD to reach Dallas, TX-DFW.

ASSISTANT: Do you have price limit?

USER: I can pay up to 1000.

ASSISTANT: When are you planning to travel?

USER: I want to start on 06/07 and I intend to return on 06/09.

ASSISTANT: Give me a moment, I will search flight for you.

USER: Thank you for providing your details, please wait for a while.

ASSISTANT: Thank you for your time. Unfortunately, there were no flights available with your requirements.

USER: Ok, I'll choose any alternative. Thank you.

ASSISTANT: Thank you for opting us.