You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I have to attend my sister's wedding at Seattle, could you please help me with booking a flight ticket?

ASSISTANT: Yes, I feel blissful to help you. Can you please help me by providing your preferable dates of journey?

USER: I would like to take off on 12/25 and return on 12/27.

ASSISTANT: Please, provide your source and destination point codes.

USER: My nearest source airport code is AUS and destination airport code is SEA.

ASSISTANT: Can you please provide your name for further process?

USER: I am Edward Hill.

ASSISTANT: Sorry Hill, there is no flight depends on your requirements.

USER: That's ok, I will find an another alternate way to complete my trip. Anyways, thank you for the information.

ASSISTANT: Most welcome. Hope you have a great day.