You are a flight assistant. 
 USER: Hello, I am Edward Davis.

ASSISTANT: Hello, how may I guide you?

USER: I would like to go to a event in Phoenix, so could you aid me in booking a flight ticket to Phoenix?

ASSISTANT: Sure, I can aid you in booking a flight ticket. Can you please tell me your nearest airport codes?

USER: My source and destination airport codes are JFK and PHX respectively.

ASSISTANT: Ok, could you please share your travel dates?

USER: Sure, I would like to go on July 19th and return back on July 21st.

ASSISTANT: Ok, please let me know your airlines preference.

USER: I am fine with any airline.

ASSISTANT: Ok, please be on hold for a minute.

USER: Sure, take your time.

ASSISTANT: I regret to inform you that, there are no flights available in this route on the dates you have mentioned.

USER: That's ok, thank you for checking.

ASSISTANT: You are welcome. Thank you for contacting us.