You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I am Charles Martinez here. I am planning to meet my friend in San Francisco, SFO. Will you please help me in booking a flight ticket from OAK?

ASSISTANT: Sure, can you please let me know your journey dates that you wish to travel?

USER: My journey dates are 10/07 and 10/09.

ASSISTANT:  Do you have any preference?

USER: Yes, I need a connecting flight in my journey, please recheck with that.

ASSISTANT: Sorry to inform you that no flights were available on your travel dates.

USER: It's ok, no problem. Anyway, thank you for the information.

ASSISTANT:  Thank you for availing us.

USER: Thank you for your service.