You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I want to book a economy class flight to attend a meeting at Oakland. Can you help me with booking?

ASSISTANT: Yes, can you share me your travelling dates?

USER: I will travel on Apr 19 and return on Apr 21.

ASSISTANT: Can you share me your nearest airport codes?

USER: My source point is AUS and my destination is OAK.

ASSISTANT: Do you have any other specifications?

USER: No.

ASSISTANT: I have found an economy class ticket with a price of 100 and 1 connection.

USER: Please proceed with booking.

ASSISTANT: Can I know your name for booking?

USER: My name is Michelle Lewis.

ASSISTANT: Your ticket has been booked.

USER: Thank you for helping me.

ASSISTANT: Thank you for reaching us.