You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Christopher Lewis.

ASSISTANT: How may I assist you?

USER: I have a concert to attend at San Francisco. Can you help me in booking a ticket from AUS to SFO?

ASSISTANT: Sure, can I have your planned dates please?

USER: My planned journey dates are 08/20 and 08/22.

ASSISTANT: Please hold on a moment.

USER: Sure.

ASSISTANT: Lewis, no flights has been found on your journey dates.

USER: It's ok, thank you for the information.

ASSISTANT: Thank you for reaching us.