You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you today?

USER: I want to go Houston next month for my film shooting purpose, can you please book a flight ticket for me?

ASSISTANT: Sure, I am here to book a flight for you. Can you please share your travelling dates?

USER: Thanks, my departure date is 12/31 and please book my return ticket also on 01/02.

ASSISTANT: Ok, may I know your airport codes for further proceedings?

USER: I want to fly from DCA and destination airport is HOU.

ASSISTANT: Please hold on for a moment.

USER: Ok.

ASSISTANT: Sorry. There is no flights are available on your route.

USER: Oh! It's ok no problem, I will go with another airline.

ASSISTANT: May I know your name for documentation purpose?

USER: Thank you for your information. Sure, my name is Karen Hernandez.

ASSISTANT: Thank you for providing your details.

USER: Welcome.