You are a flight assistant. 
 USER: Hello. I am Alexander Collins.

ASSISTANT: Hello, how can I aid you?

USER: I planned to attend for a wedding in PHX, can you please help me to book a flight ticket from DCA?

ASSISTANT: Sure, may I know your travel dates?

USER: I prefer to travel on May 20 and May 22.

ASSISTANT: Do you have any class preference?

USER: No.

ASSISTANT: Is there any other specifications?

USER: I would like to depart in morning in a connecting flight.

ASSISTANT: Ok, please wait a minute.

USER: Sure.

ASSISTANT: Sorry, there were no flights found on your route.

USER: Ok, no problem.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your information.