You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how exactly I can serve you the best today?

USER: Can you aid me to book a flight ticket from LAX to IAD?

ASSISTANT: Kindly mention your travelling dates?

USER: My trip dates are Nov 9 and Nov 11 respectively.

ASSISTANT: Do you have any requirements in connections?

USER: I prefer for single connecting flight to travel.

ASSISTANT: May I know your name?

USER: Helen Thompson here.

ASSISTANT: Is there any other specifications for your journey?

USER: No specifications for me.

ASSISTANT: Please wait.

USER: Ok.

ASSISTANT: Sorry Thompson here, we haven't found any flights based on your specifications.

USER: It's ok.

ASSISTANT: Thanks for reaching us.

USER: Thank you for the help.