You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello.

USER: I am Justin Walker.

ASSISTANT: How may I help you?

USER: I want to book a flight ticket to Phoenix as I want to go for a live concert.

ASSISTANT: Ok.

USER: Please book a connecting flight.

ASSISTANT: Sure, I am will check flight based on your request. Please mention the airport codes of both locations.

USER: I want to fly from DC- DCA to AZ- PHX.

ASSISTANT: Ok, may I know when are you planning to go for live concert?

USER: My travelling dates are from 06/12 to 06/14.

ASSISTANT: Ok, please wait, I will revert you.

USER: Ok.

ASSISTANT: Thanks for waiting, but no flights are available. Thanks for reaching us.

USER: Ok, no issues. Thank you.