You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

USER: Myself Sandra King and I want to travel from Los Angeles to Philadelphia. Can you please book a flight ticket to the above locations?

ASSISTANT: King, can you provide me your dates of travel ?

USER: Sure, I want to travel in the month of December for Christmas vacation. So, my travelling dates will be on 12/21 to 12/23.

ASSISTANT: That's great Sandra, can I know your airport codes?

USER: Sure, my near by airport codes are from LAX to PHL.

ASSISTANT: I'm sorry Sandra, there are no flights with your preferable dates.

USER: OK, no problem.

ASSISTANT: Thank you, have a good day.

USER: Thank you for the information.