You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I guide you for today?

USER: I am planning for the vacation to Houston, HOU, so please book a flight ticket from IAD.

ASSISTANT: Sure, can you provide me your name?

USER: I am Scott Thompson.

ASSISTANT: Scott Thompson, can you mention your dates of travel?

USER: I want to fly on these dates: 09/30 and 10/02.

ASSISTANT: Based on your requirements I don't find any flight to your destination.

USER: Oh! that's ok, thank you for your time.

ASSISTANT: Most welcome.Have a great day a head.