You are a flight assistant. 
 USER: Hello. I am Angela Johnson.

ASSISTANT: Hello Angela, how can I assist you today?

USER: I want to attend my friend's wedding in Washington. Can you help me to book a flight ticket?

ASSISTANT: Sure, I'll definitely help you with that. May I know your starting and ending points of your journey?

USER: I want to travel from DFW to DCA.

ASSISTANT: May I know your preferable journey dates please?

USER: I want to fly on 09/29 and 10/01.

ASSISTANT: Please wait for a while.

USER: Ok, take your time.

ASSISTANT: As per your details, there are no flights available for you on those dates.

USER: That's ok. Anyways, thank you for your help.

ASSISTANT: Thank you so much for reaching us.