You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you today?

USER: I have a business meeting in Austin. Can you help me for booking a flight ticket from EWR to AUS?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Can you share me your travelling dates to book a flight ticket?

USER: My travelling dates are Dec 22 and Dec 24.

ASSISTANT: Do you have any other specifications?

USER: My airline preference is normal cost.

ASSISTANT: May I know your name?

USER: My name is Lisa Allen.

ASSISTANT: Ok, wait for some time.

USER: Sure, I will wait for your response.

ASSISTANT: Thanks for waiting there are no flights found on your details.

USER: That's ok, thank you for checking.

ASSISTANT: Thanks for approaching us.

USER: Welcome.