You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: I am looking for a flight from DCA to SFO, can you help me out?

ASSISTANT: Sure, can you please provide me the itinerary travel dates?

USER: My trip dates are from Sept 1st till Sept 3rd.

ASSISTANT: Let me know if you have any connection limit?

USER: I am looking for a connecting flight.

ASSISTANT: Are there any more preferences that you want to avail?

USER: I would like to start my journey in evening session and I prefer to travel in normal-cost.

ASSISTANT: May I know your good name?

USER: Myself Rachel Hall.

ASSISTANT: Give me a moment.

USER: Sure, take your own time.

ASSISTANT: Rachel Hall. I regret to inform that there are no flights on your route with the given dates.

USER: That's ok, not an issue. Thank you for your information.

ASSISTANT: Thank you for reaching us.