You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Can you aid me to book a flight ticket from IAD to SFO?

ASSISTANT: Sure, when are you planning to start and return on?

USER: I planned my trip on the dates Feb 13 and Feb 15.

ASSISTANT: Do you have any particular time for departing and returning?

USER: No.

ASSISTANT: May I know your other specifications?

USER: Sure, I am looking for a connecting flight.

ASSISTANT:  May I know your name for the documentation process?

USER: Yes, myself Samuel Thomas.

ASSISTANT: Sorry, no flight is available for you as per your requests.

USER: No issue, anyway thank you for checking.

ASSISTANT: Welcome Samuel Thomas.