You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I support you for the day?

USER: I am Margaret Jackson. Can you please make me a flight ticket reservation on 12/11 from Washington to Houston?

ASSISTANT: Sure.

USER: Thank you.

ASSISTANT: Can I know your boarding airport code please?

USER: I wish to board at DC - DCA.

ASSISTANT: When are you willing to return your journey?

USER: I would like to return on 12/13.

ASSISTANT: May I know the airport code that you wish to land to?

USER: I want to land in TX - HOU.

ASSISTANT: Do you need a connecting flight?

USER: I need a single connection.

ASSISTANT: Please, wait for a while.

USER: Sure.

ASSISTANT: Thank you for waiting.

USER: My pleasure.

ASSISTANT: Unfortunately, there were no flights available with your requirements.

USER: Not a problem, thank you.

ASSISTANT: Thank you for approaching us.