You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Can you help me to book a flight ticket from AUS to EWR?

ASSISTANT:  Please provide your journey dates?

USER: My travelling dates are 09 to 11 of May.

ASSISTANT: Is there any time concern?

USER: No.

ASSISTANT: Do you have any preferences?

USER: I would like to travel in economy with a connecting flight.

ASSISTANT: Can I know your name?

USER: I am Sandra Baker.

ASSISTANT: Sorry currently there are no flights for your requirement.

USER: It's ok, not a problem, thank you.

ASSISTANT: Thank you.