You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello! tell me how can I help you?

USER: I'm Donna Johnson, can you help me in booking a flight ticket?

ASSISTANT: OK,can you tell me your journey details?

USER: I want to travel from DFW to SFO to attend a business meeting.

ASSISTANT: Can you please tell me the travelling dates?

USER: The dates of travel are 05/31 and 06/02 respectively.

ASSISTANT: Sorry for the inconvience, there are no flights available on your date.

USER: That's fine.

ASSISTANT: Thank you for contacting us.

USER: Thank you for your time.