You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I would like to book a flight ticket from Washington to visit Pioneer Plaza in Dallas. Could you please help me to book a flight ticket with single connection?

ASSISTANT: Sure, I am glad to help you. May I know your itinerary dates?

USER: I want to reach TX on Apr 2nd and I'll return within two days that is on Apr 4th.

ASSISTANT: Which airport do you prefer in Washington?

USER: I like to start my journey from IAD and my landing airport code is DFW.

ASSISTANT: Which class do you prefer?

USER: I am happy with any kind of ticket.

ASSISTANT: May I know your name?

USER: I am John Williams.

ASSISTANT: Sorry John Williams, no flights are available on your planned dates.

USER: That's ok, I'll choose any alternative to reach my destination.

ASSISTANT: Ok.

USER: Thank you for your information.

ASSISTANT: Thank you for choosing us.