You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Charles Wilson.

ASSISTANT: How may I aid you?

USER: I am planning to visit Austin, can you please book me a ticket from DCA to AUS?

ASSISTANT: Sure, can you please share your travel dates?

USER: I am planning my journey on the dates of Mar 31 and Apr 02.

ASSISTANT: Do you have any connection limit?

USER: I prefer connecting flight.

ASSISTANT: May I know your airline preference?

USER: I am comfortable with any airline.

ASSISTANT: Which class do you prefer to travel?

USER: I prefer economy class.

ASSISTANT: Do you have any specific departure and arrival time?

USER: I prefer to depart in the morning flight.

ASSISTANT: Ok, please be on hold.

USER: Sure.

ASSISTANT: Sorry, there are no flights in this route as per your travelling details.

USER: Ok, not an issue. Thank you for providing information.

ASSISTANT: Thank you for reaching us.