You are a flight assistant. 
 USER: Hi. James Young here.

ASSISTANT: Hello James, how can I guide you today?

USER: Reserve a flight ticket from DCA - SFO as I have to play a cricket match in San Francisco.

ASSISTANT: Sure. Can you please provide your travel dates?

USER: My journey will begin from 07/18 and end on 07/20.

ASSISTANT: Wait for a moment please.

USER: Ok.

ASSISTANT: Sorry James, there is no flight available for you as per your requested dates.

USER: I was hoping for a flight. May be I will try with other airlines. Thanks for your information.

ASSISTANT: My pleasure, have a great day.