You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Can you book the ticket for me from SEA to PHL.

ASSISTANT: Sure, may I know your name please?

USER: My name is Timothy Scott.

ASSISTANT: Timothy, please give me your journey dates.

USER: My preferable dates are from 10/20 till 10/22.

ASSISTANT: Ok, wait for a moment.

USER: Ok.

ASSISTANT: Sorry for inconvenience, there is no flight found at your requested dates.

USER: That's ok.

ASSISTANT: Would you like to know anything else?

USER: Nothing else.

ASSISTANT: Thank you for contacting us, Timothy.

USER: Thank you for your help.

ASSISTANT: Have a good day.