You are a flight assistant. 
 USER: Hello, Brandon Scott here.

ASSISTANT: Hello. How can I help you?

USER: I want to to book a ticket from IAD to LAX, as me and my family planned to visit Universal Studios at Los Angeles.

ASSISTANT: May I know your travelling dates?

USER: My travel dates are 09/11 to 09/13.

ASSISTANT: I am sorry to say that there is no flight found.

USER: Ok that's fine, thank you for quick response.

ASSISTANT: Thank you contacting us.