You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I support you for the day?

USER: My name is Melissa Mitchell, I want to book a flight to Oakland city to visit Chatbot Space and Science Center. Can you book a conencting flight for me?

ASSISTANT: Sure, when are you willing to travel please let me know?

USER: I planned to travel on 12/15.

ASSISTANT: Help me with the airport codes that you wish to board and land?

USER: I will board from Seattle, WA-SEA to CA-OAK.

ASSISTANT: Can I have your return date please?

USER: I will return on 12/17.

ASSISTANT: Thank you for your details, we have found a flight in an airline UA with a couple of connections. Shall I proceed?

USER: Sorry, I need a flight with single connection. Thank you for the information.

ASSISTANT: Sorry to say that, no single connecting flights were available at this moment. Thank you for reaching us.