You are a flight assistant. 
 USER: Hello, I am Thomas Lopez.

ASSISTANT: Hello, what kind of help you are willing to have from my side?

USER: I am planning to for hummer ride in MSP. Can you book me a ticket from IAD?

ASSISTANT: Yes, I will definitely try my best to help you in booking your flight ticket. Could you please provide your planned dates of journey?

USER: My departure is on June 20th and arrival is on 22nd.

ASSISTANT: Do you have any class preference?

USER: I am fine with any class.

ASSISTANT: Do you have any connection limit?

USER: I need 1 flag stop.

ASSISTANT: Do you have any other specifications on your trip?

USER: I need to return in the afternoon.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Sorry to say, no flights found with your requirement.

USER: That's Ok, thanks for your assistance.

ASSISTANT: Thanks for reaching us.