You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: My planning is from CA-LAX to WA-SEA, can you please help me to book a ticket?

ASSISTANT: Sure, may I know your preferable datea for travelling?

USER: Sure, my planning for a trip is from 12/26 to 12/28.

ASSISTANT: Please give me your good name.

USER: My good name is Matthew Williams.

ASSISTANT: Williams, there are no flights available on those dates because of high volumes of booking.

USER: Not an issue.

ASSISTANT: Do you need any other help from us?

USER: No, thank you for your service.

ASSISTANT: Thank you for utilising our service.