You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Myself David Martin. Can you please book a flight ticket from BOS to PHX locations?

ASSISTANT: Ok, will assist you on the booking. May I know your travel dates?

USER: My travelling dates are from 12/09 and 12/11.

ASSISTANT: There is no flight at your location provided.

USER: It's ok. Thank you for the information.

ASSISTANT: Sorry for the inconveniences. Thank you for choosing our agency.