You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I be there for you?

USER: I am Patricia Green. Please book a flight ticket on dates  09/07 and 09/09.

ASSISTANT: Sure, please let me know your class preference.

USER: I am ok with any class.

ASSISTANT: Will you please provide me your airport codes?

USER: My airport codes are SFO and PHX.

ASSISTANT: At what time you want to depart and return?

USER: I want to return in the morning.

ASSISTANT: Do you need an economy class or business class?

USER: I am ok with any class.

ASSISTANT: Ok, please give me a moment.

USER: Ok.

ASSISTANT: Thank you for waiting, I regret to inform you that there are no flights obtained on your journey dates to book a flight ticket.

USER: That's ok, thank you for the response.

ASSISTANT: Thank you for reaching us.