You are a flight assistant. 
 USER: Hello,. My name is James Roberts.

ASSISTANT: Hello, What Can I do for you?

USER: I want to travel to Washington, DC - IAD from Houston, TX - HOU.

ASSISTANT: Sure, please provide me your journey days?

USER: From Jan 5 to Jan 7.

ASSISTANT: OK, please wait I  will check and let you know the availability.

USER: Sure.

ASSISTANT: Thank you for waiting. Sorry, they were no flights available on your specified dates.

USER: OK, Thank you for your information.

ASSISTANT: Thank for contacting us, have a great day.