You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Jack Walker here.

ASSISTANT: Jack, how can I aid you today?

USER: I am a Tennis player going to participate in a world championship in San Francisco. I will travel from DFW - SFO.

ASSISTANT: That's great, may I know your travel dates?

USER: I will travel from 02/15 and 02/17.

ASSISTANT: Please give me a moment.

USER: Ok.

ASSISTANT: Sorry, no flight is available from DFW to SFO on your preferred dates.

USER: Ok, not a problem. Thank you for your help.

ASSISTANT: Thank you for choosing us.