You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I be at your service?

USER: I am Jessica Johnson. Can you please book a flight ticket in my preferable travel dates 01/28 and 01/30?

ASSISTANT: Sure, I am here to help. Please provide me your origin and destination airport codes?

USER: My origin and destination airport codes are DC-DCA and CA-SF0.

ASSISTANT: Do you have any connecting flight preference?

USER: I am comfortable with any one.

ASSISTANT: I am sorry to inform you that there are no flights available on given dates from you.

USER: Ok, not a problem. I will found an alternative solution to reach the destination.

ASSISTANT: Thank you for checking it with us. Hope to serve you better next time.

USER: Thank you for the information.