You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, How can I serve you?

USER: I am Emily Nelson. Could you please reserve me a flight ticket from Austin, AUS as I have to participate in a basket ball match in my college?

ASSISTANT: Sure, May I know the destination code?

USER: My destination is Philadelphia, PHL.

ASSISTANT: Please help me with your travel dates.

USER: My journey dates are from 12/24 to 12/26.

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

USER: It's ok. Thank you for the response.

ASSISTANT: Thank you for opting us.