You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I have to go DCA for my film shooting purpose, can you please book a flight ticket for me?

ASSISTANT: Sure, what are your willing dates to travel?

USER: I want to fly from Houston on 07/23 and please book my return ticket also on 07/25.

ASSISTANT: Ok, may I know your source code to proceed further?

USER: My source airport is HOU.

ASSISTANT: Ok, there is a flight 1025 in Hawaiian airline matching your details with price 100. Shall I proceed?

USER: Please proceed.

ASSISTANT: May I know your name to book the ticket?

USER: Sure, my name is Katherine White.

ASSISTANT: Ok, your booking is done.

USER: Thank you for your help.

ASSISTANT: You are welcome, have a safe journey.