You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I be at your service today?

USER: Can you please book me a flight ticket from LAS to AUS to meet my family?

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

USER: I have planned to travel on June 18th and return on June 20th.

ASSISTANT: Do you have any other specifications?

USER: I want to depart at morning time.

ASSISTANT: Please help me with your name for booking.

USER: Nancy Nelson.

ASSISTANT: Sorry for this inconvenience, I could not find any flight with your requirements.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for reaching us.