You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you out?

USER: Linda Parker here. I want to travel from AUS to SFO for attending a seminar. Can you please help me for booking the flight ticket?

ASSISTANT: Sure, I will help you in booking the ticket. May I know your travelling dates please? Ok, please wait a moment.

USER: My travelling dates are 07/04 and 07/06.

ASSISTANT: Sorry, there are no flights found on these dates.

USER: So sad for that. Thank you for helping me.

ASSISTANT: Thank you for choosing our services.