You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Could you book my ticket in a direct flight?

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

USER: My itinerary dates are July 20 and July 22.

ASSISTANT: Please share me your source and destination codes.

USER: I want to travel from LAS to AUS.

ASSISTANT: Do you have any other specifications?

USER: I have no other preferences in my journey.

ASSISTANT: Please help me with your name for booking.

USER: Jerry Collins here.

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

USER: No problem, thank you.

ASSISTANT: Thank you for reaching us.