You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How could I support you today?

USER: I want to travel from AUS to EWR. Can you help me to book a flight ticket?

ASSISTANT: Sure, I will help you in booking. When you are planning to travel?

USER: I want to fly in the flight on July 15 and July 17.

ASSISTANT: Please provide your good name.

USER: I am Melissa Garcia.

ASSISTANT: Do you have any other specifications?

USER: I want to prefer normal-cost airline.

ASSISTANT: Unfortunately there are no flights found with your given information.

USER: That's ok. Anyways, thank you for your help.

ASSISTANT: Thank you for choosing us.