You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I guide you?

USER: I am Amy Clark. I would like to book a ticket to Philadelphia, can you please help me out?

ASSISTANT: Sure, can you help me with your travelling dates?

USER: I am travelling on these dates 11/06 and 11/08.

ASSISTANT: May I know your airport codes?

USER: I am flying from DFW to PHX.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry, no flight is available for you on your requested dates.

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

ASSISTANT: Thank you for choosing us, have a nice day.