You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Anna Robinson.

ASSISTANT: How can I assist you today?

USER: I am planning to visit Detroit to attend automobile exhibition, can you please book me the ticket from IAD to DTW?

ASSISTANT: Sure, I can help you with that. May I know your planned travel dates please?

USER: My preferable journey dates are from 01/16 to 01/18.

ASSISTANT: Ok, please wait for a while.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry to inform you that there are no flights available for you on those dates.

USER: That's ok. I will find any alternate for this trip.

ASSISTANT: It's better, Anna.

USER: Anyways, thank you for providing information.

ASSISTANT: Thank you for reaching us.