You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: I am Dorothy Jackson. I have to attend a Music Concert at Seattle, could you please help me with booking a flight ticket from LGA to SEA?

ASSISTANT: Sure, I am here to help you but I need your travelling dates.

USER: I would like to depart on Dec 7th and return on Dec 9th.

ASSISTANT: Sorry, I could not find any flight with your travelling dates.

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

ASSISTANT: Thanks for choosing us.