You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Christine Carter here.

ASSISTANT: How may I assist you at this moment?

USER: Can you please help me in booking my flight from DCA to reach HOU, as I have to meet my friends there?

ASSISTANT: Sure, I am oblige to help you with that. Can you please provide your preferable dates of travelling?

USER: Sure, my travel dates are Sep 8th and 10th.

ASSISTANT: At what time are you planning to depart and return?

USER: I want to return in the morning.

ASSISTANT: Any connection limit do you have?

USER: I need a direct flight.

ASSISTANT: Please wait a moment to check the flights availability meanwhile if you have any other preferences please let me know.

USER: Ok, sure. I will wait for your response.

ASSISTANT: We regret to tell you that, there are no flights available for your journey with your required preferences.

USER: Ok, fine. Not a problem. Thanks for the information.

ASSISTANT: Thank you for availing us, have a great day.