You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, can you please tell me how may I help you?

USER: I am Brian Smith, can you help me to book a flight ticket?

ASSISTANT: Can you please tell me your location codes for your journey?

USER: Sure, I am happy to travel from AUS to EWR.

ASSISTANT: Can you please provide me your travelling dates?

USER: I am planning to travel on 01/23 and 01/25. Did you find any flight?

ASSISTANT: Sorry to say,  there is no flight ticket found on your dates.

USER: Oh! that is fine. Thank you for your help.

ASSISTANT: Thank you for contacting us.