You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assess you?

USER: I am Thomas Robinson. Can you please book a flight ticket from AUS to DCA?

ASSISTANT: Sure, I need your travel dates for better searching. Can you please help me in providing your travel dates?

USER: Sure, I need to travel on dates of 07/25 and 07/27.

ASSISTANT: Please give me a moment.

USER: Sure, take your time.

ASSISTANT: Thank you for waiting, no flights are moving on your travel dates to book the flight ticket.

USER: Oh! It is sad to hear. Anyway, thank you for your time.

ASSISTANT: It's my pleasure and thank you for reaching us.

USER: Most welcome.