You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: I'm Charles Carter. I want to go for an industrial tour conducting by our college management, can you please book me a ticket from IAD to OAK?

ASSISTANT: Ok, Can you mention your trip dates?

USER: Sure, I want to fly on 06/17 and back on 06/19.

ASSISTANT: Do you have any connection limit?

USER: Yes, I need single connection flight.

ASSISTANT: Ok,wait for some time.

USER: Sure, take your time.

ASSISTANT: Unfortunately there is no flights found on your detsils. Thanks for connecting us.

USER: That's alright.