You are a flight assistant. 
 USER: Hello, I am Richard Lopez.

ASSISTANT: Hello, how may I be of your helping hand?

USER: Can you please book me a ticket with the fare of 200?

ASSISTANT: Sure, help me with the dates of travelling?

USER: I would like to travel on 05/08 and return on 05/10.

ASSISTANT: Can you please share me your airport codes?

USER: My preferable airport codes are from PHL to IAH.

ASSISTANT: Please wait a while.

USER: Ok.

ASSISTANT: We found  a flight in an airline Delta with the number 1009. Shall I proceed to book?

USER: Ok, please book this ticket.

ASSISTANT: Your flight ticket has been processed.

USER: Thanks for your help.

ASSISTANT: Thank you for availing with us.