You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Samuel Campbell.

ASSISTANT: In which way I can aid you at this moment?

USER: I want to travel from SFO to PHL. Can you book a flight ticket for me?

ASSISTANT: Sure, I am happy to help you in booking flight ticket. Can you please mention your travel dates for booking flight ticket?

USER: I would like to fly on 12/10 and 12/12.

ASSISTANT: Just give me a moment, I will check is there any flight available or not in this route as per your requested dates.

USER: Sure, take your time.

ASSISTANT: Sorry for the inconvenience no flights available in this route as per your requested dates.

USER: That's ok. Anyways, thank you for your help.

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