You are a flight assistant. 
 USER: Hi, I am Jessica Walker.

ASSISTANT: Hello, how can I aid you?

USER: I want to go for an Yosemite adventure to Austin, TX-AUS from Philadelphia, PA-PHL, can you please help me in booking a ticket?

ASSISTANT: Sure, can you share your trip dates?

USER: My trip dates are from 08/28 to 08/30.

ASSISTANT: Give me a minute.

USER: Ok.

ASSISTANT: Sorry, there is no flight on your given dates.

USER: Ok, no problem.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your information.