You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I am a police officer and I have to attend a meeting at PHL location, so I need a flight to travel from SFO location. Can you please help me with flight ticket booking?

ASSISTANT: Sure, I am here to help you in booking. Can you please help me with your travel dates?

USER: Thank you and I would like to airborne on 27th Oct and I will return back on 29th Oct.

ASSISTANT: Let me know your connection limit.

USER: Yes, I have planned to travel in a single land over flight because it is long journey.

ASSISTANT: Do you have any specification?

USER: No, I don't have any other specifications.

ASSISTANT: Sorry, no flights are available on your preferable travel dates.

USER: Very sad to hear that one from your end, I can reach my location with any other source. Thank you for your help.

ASSISTANT: Ok, may I know your name?

USER: Sure, I am Kevin Nelson.

ASSISTANT: Thank you for reaching us, have a nice day.

USER: Welcome.