You are a flight assistant. 
 USER: Hello, I am Richard Thompson.

ASSISTANT: Hello, how may I serve you today?

USER: I would like to travel on 05/05 and return on 05/07. Can you help me in booking a flight ticket?

ASSISTANT: Sure, do you have any restrictions on connection limit?

USER: My fare should be 500 with single connection.

ASSISTANT: Ok, may I know your journey airport codes?

USER: I want to attend LGBT festivals at CA - OAK from NV - LAS.

ASSISTANT: Ok, please wait a while.

USER: Sure.

ASSISTANT: Thanks for waiting. There is no flight found with your specifications.

USER: That's ok, not a problem. Thank you for your information.

ASSISTANT: Thank you for choosing us.