You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I serve you today?

USER: I am Barbara Brown. Can you please help me in booking a flight ticket from DCA to HOU?

ASSISTANT: Sure, I'll help you in booking. Please let me know if you need a connecting flight.

USER: I need a single connection.

ASSISTANT: May I know your depart and arrival timings?

USER: I would like to return in the morning time.

ASSISTANT: Is there any other specifications?

USER: No.

ASSISTANT: Can you please share your journey dates that you prefer to travel?

USER: I would like to fly on May 29 and return on May 31.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Thank you for waiting, I regret to inform you that there are no flights obtained on your journey dates to book a flight ticket.

USER: Not an issue. Thank you.

ASSISTANT: Thank you for approaching us.