You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Anna Phillips.

ASSISTANT: How can I help you at this moment?

USER: I am looking to book a flight ticket to meet my friend in Washington. Can you help me for booking a flight ticket from IAH to IAD?

ASSISTANT: Sure. Can you please mention your preferable travel dates?

USER: My travelling dates are June 23 and June 25.

ASSISTANT: Do you need any specific depart and arrival time for this trip?

USER: My departure time is afternoon.

ASSISTANT: Are you okay with connecting flight or you need any direct flight?

USER: Ok.

ASSISTANT: May I know your connection limit?

USER: I need a single connecting flight.

ASSISTANT: Ok, please wait a moment. Sorry, no connecting flights are available in this route as per your requested dates.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for reaching us.