You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: Please book me a flight ticket from BOS to DFW to meet my family.

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

USER: I have planned to travel on June 23rd and return on 25th.

ASSISTANT: Do you prefer either economy or business class to travel?

USER: I am ok with any class.

ASSISTANT: Are you flexible to fly in any airlines?

USER: Yes.

ASSISTANT: Do you have any particular depart and return times?

USER: I am with any time.

ASSISTANT: May I know your name to move forward with the process?

USER: Myself Pamela Miller.

ASSISTANT: Please hold on for a moment.

USER: Ok.

ASSISTANT: I am sorry to inform you that we don't have any flight available for your journey criteria.

USER: Thank you.

ASSISTANT: Than you for checking it with us.