You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you today?

USER: Donald Taylor here, please help me in booking the ticket from SFO to IAH.

ASSISTANT: Sure, can you please share your travel dates?

USER: My travel dates are 05/12 and 05/14.

ASSISTANT: Let me check for the availability of flight.

USER: Sure.

ASSISTANT: Donald, there is no flight available at your requested dates.

USER: That's ok, thank you for your time.

ASSISTANT: Thank you for contacting us.