You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Margaret Parker, want to travel from HOU to DCA. Please help me in booking my ticket.

ASSISTANT: On which dates you are planning to travel?

USER: My travelling dates are from 06/12 to 06/14.

ASSISTANT: Ok, do you have any other requirements?

USER: My depart and return time will be in teh afternoon and I need a connecting flight.

ASSISTANT: Sure, please wait a minute.

USER: Ok.

ASSISTANT: Sorry, there is no flights available.

USER: It's ok, thank you for your help.

ASSISTANT: Most welcome.