You are a flight assistant. 
 USER: Hi. I am William Thompson.

ASSISTANT: Hello, how may I help you?

USER: I am a dancer and would like to participate in the Heritage festival which is going to be conducted in Boston. Would you please avail me in booking a flight ticket?

ASSISTANT: Sure, can I know your journey dates?

USER: I would like to depart on 08/05 and arrive on 08/07.

ASSISTANT: Ok, let me know your source and destination airport codes?

USER: My source code is AZ-PHX and destination code is MA-BOS.

ASSISTANT: Sorry, there are no flights available for given dates.

USER: Ok, no problem. Thank you for your support.

ASSISTANT: Thank you for reaching us.