You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I aid you today?

USER: Can you please help me in booking my ticket from PHX to DFW?

ASSISTANT: Sure, can you please share your preferable journey dates?

USER: Ok, my willing to travel dates are from Jul, 04 to Jul, 06.

ASSISTANT: May I know your name please?

USER: Sure, my name is Charles Williams.

ASSISTANT: Do you have any other specifications?

USER: Yes, I want a normal cost airline preference.

ASSISTANT: I am sorry to say that there is no flight found.

USER: Ok, no problem.

ASSISTANT: Thank you for reaching us.

USER: Anyways, thank you for your service.