You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

USER: Please help me to make a flight ticket reservation from SFO to PHX.

ASSISTANT: May I know your trip dates?

USER: Thank you for considering my request. My trip dates are Aug 8th and Aug 10th.

ASSISTANT: Do you have any specifications?

USER: I am looking for a return flight in the evening time. So, please search for that.

ASSISTANT: May I know your name?

USER: I am Catherine Hernandez.

ASSISTANT: Sorry to inform you that unfortunately there is no flights available by the given details.

USER: Oh! It is sad to hear from your end. Anyhow thanks a lot for your assistance.

ASSISTANT: Thank you.