You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Mark Hernandez from Charlotte.

ASSISTANT: How may I assist you?

USER: Due to sudden meeting scheduled at Austin, I would like to book a ticket to Austin. Can you help me in booking a ticket?

ASSISTANT: Can I have your travelling dates please?

USER: My planned journey dates are 03/23 and 03/25.

ASSISTANT: May I know your nearest airport codes please?

USER: The respective airport codes are CLT and AUS.

ASSISTANT: Please wait a moment.

USER: Sure.

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

USER: Its ok, thank you for the information.

ASSISTANT: Thank you for approaching us.