You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

USER: I am Larry Johnson, I am looking for a direct flight to Seattle to visit my uncle. Can you help me with booking?

ASSISTANT: Sure, I am here to help you. Please help me with your travelling dates?

USER: I will travel on 04/15 and return on 04/17.

ASSISTANT: Do you have any price restrictions?

USER: I can spend up to 500 on flight ticket.

ASSISTANT: Please help me with your airport codes?

USER: My source point is St.Paul MN-MSP and destination is WA-SEA.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Thanks for waiting. no flights are available based on your requirement.

USER: Ok, thank you for your service.

ASSISTANT: Thanks for connecting with us.