You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I aid you?

USER: I want to travel from SFO to DCA, can you please reserve me a flight ticket?

ASSISTANT: May I know your preferable depart and return journey timings?

USER: I am comfortable with any timings.

ASSISTANT: Any other specifications to be met?

USER: Yes, I want a single connection in between my journey.

ASSISTANT: Sure, can you please specify me your dates of travel?

USER: My travel dates are from Sept 27th to Sept 29th.

ASSISTANT: May I know your name?

USER: I am Dorothy Phillips.

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

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for reaching us.