You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello,.

USER: I am Barbara Roberts.

ASSISTANT: Roberts, What can I do for you today?

USER: Due to an emergency at our Washington's branch I need to travel on 12/25 from San Francisco. Could you please help me with booking a flight ticket?

ASSISTANT: Sure, I can help you in that.

USER: Thank you.

ASSISTANT: Could you let me know, your return date?

USER: Sure, I will return back on 12/27.

ASSISTANT: Ok, Please specify the San Francisco airport code and Washington airport code?

USER: Sure, Washington, IAD is my destination point and San Francisco, SFO is my source point.

ASSISTANT: Are you comfortable with the direct flight?

USER: No, I need a connecting flight.

ASSISTANT: Sorry, we cannot provide you the connecting flight at this time.

USER: No issues, I will search another way to reach my destination. Thank you.

ASSISTANT: Ok, Thank you for choosing us.