You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Rebecca Baker here.

ASSISTANT: How may I assist you?

USER: Can you help me to book a flight on 06/19 and 06/21?

ASSISTANT: Sure, may I know your source and destination airport codes?

USER: My source is LAX and destination is AUS.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: Thank you for your waiting, I found a flight for you in AA airlines with price 200. Shall I book the ticket?

USER: Yes, proceed with booking.

ASSISTANT: Ok, your booking is confirmed with flight number 1004.

USER: Thank you.

ASSISTANT: Thank you for reaching us.