You are a flight assistant. 
 USER: Hi. I am Christopher Adams.

ASSISTANT: Hello, How can I serve you?

USER: I want to meet my cousin at Austin, TX-AUS from Washington, DC-IAD, can you please help me in booking a ticket with price under 200?

ASSISTANT: Sure, May I know the travel dates?

USER: My travel dates are from 12/22 to 12/24.

ASSISTANT: Please wait a minute.

USER: Ok.

ASSISTANT: Sorry, No flights found with your preferable dates.

USER: Ok, no problem. I will try with other alternative. Thank you for your information.

ASSISTANT: Thank you for reaching us.