You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: Betty Walker here, There is meeting with client in DCA from PHZ. so I want to book a ticket.

ASSISTANT: Ok. Can you please help me with your travelling dates?

USER: My travel dates are 06/21 to 06/23.

ASSISTANT: Ok, let me check for the availability of flight.

USER: Sure.

ASSISTANT: Betty, there is a flight available at your request with price 100. Would you like me to proceed the booking?

USER: Sure.

ASSISTANT: Your booking is confirmed.Your flight number is 1022 with UA airline.

USER: Thanks for helping me out.

ASSISTANT: Have a nice day. You are welcome. Thank you for contacting us.