You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Thomas Walker.

ASSISTANT: How can I assist you at this moment?

USER: I would like to book a ticket to Seattle, can you please help me out?

ASSISTANT: Sure, I am happy to help you with that. Can I have your travel dates please?

USER: I am travelling on these dates 06/03 and 06/05.

ASSISTANT: Ok, please let me know airport codes too.

USER: I am flying from AUS to SEA.

ASSISTANT: Ok, please wait a moment to check flight availability.

USER: Sure.

ASSISTANT: Sorry to inform you that no flight is available to you on your dates.

USER: Ok no problem, thank you for your services.

ASSISTANT: Thank you for choosing us.