You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: I am Carolyn Moore. I need to book a ticket to meet my professor on 12/15 and return to Los Angeles on 12/17. Could you please help me in doing that?

ASSISTANT: Sure, may I know how much you can afford for this journey?

USER: I can pay up to 500.

ASSISTANT: Ok, please share your journey codes.

USER: My airport codes are LAX and IAD.

ASSISTANT: Ok, please stand by.

USER: Sure.

ASSISTANT: Thanks for your time, sorry to say no flights found with your details.

USER: No problem, I may choose an other way.

ASSISTANT: Thank you for reaching us, have a nice day.

USER: Thank you for your information.