You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Frank Davis.

ASSISTANT: How can I help you?

USER: I would like to spend some days in Austin, can you help me to book a flight ticket?

ASSISTANT: Sure, I will help you. Can you please tell me your planning dates of journey?

USER: My travelling dates are 07/04 and 07/06.

ASSISTANT: May I know your nearest airport codes?

USER: Sure, my airport codes are DCA and AUS.

ASSISTANT: Please wait a moment.

USER: Sure, take your time, please find a flight with best facilities.

ASSISTANT: Sorry, no flights are available on your planning dates.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for reaching us.