You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I am Charles Johnson. I have a plan to visit zoo at Los Angeles, please book a flight ticket under price 500.

ASSISTANT: Sure, can I know your travelling dates?

USER: My travelling dates are depart date on 03/09 and return date on 03/11.

ASSISTANT: Ok, let me know your origin and destination airport codes?

USER: I want to fly from IAD to LAX.

ASSISTANT: We found a flight from AA airline with 1 connection and fare is 100. Shall I proceed?

USER: Please go ahead.

ASSISTANT: You ticket is booked with 1020 flight number.

USER: Thank you.

ASSISTANT: Thank you for reaching us.