You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Jessica Young.

ASSISTANT: How may I help you?

USER: Please book me a ticket from PHX to DCA to meet my family.

ASSISTANT: Sure, tell me your travel dates please?

USER: I have planned to travel on 08/03 and 08/05.

ASSISTANT: Please wait.

USER: Ok.

ASSISTANT: Thanks for waiting. But I am sorry to say that there are no flights available.

USER: Ok, no problem. Thank you.