You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I am very crazy about racing so I want to go Formula Racing Center in TX - HOU on my holiday that is on 06/17. Can you help me to book my flight ticket?

ASSISTANT: Sure, may I know your dates of journey please?

USER: My source is DC - IAD and want to get back IAD on 06/19.

ASSISTANT: Wait for a moment.

USER: Ok.

ASSISTANT: Sorry, I did not find any flight basing on your details.

USER: I am Helen Phillips.

ASSISTANT: Thank you for your help.

USER: It's Ok, thank you for the information.

ASSISTANT: You are welcome.